Best Sci-Fi Anime of 2003

In the subterranean city of Lux, shrouded in darkness, its inhabitants live under constant dread and subjugation by competing criminal syndicates. Cut off from the world above, these gangs interact with the surface solely through the mining of "raffia," the city's sole reason for existence. This rare mineral, found only in Lux, serves as the foundation for "texhnolyze" transplants, which allow humans to replace body parts with cybernetic limbs. These prosthetics uniquely avoid immune rejection, and the mysterious "Class" organization holds the privilege of researching them. The Class, which also oversees raffia production, entrusts its executive power to a group called Organo, led by Keigo Oonishi—a self-righteous man with texhnolyzed legs, rumored to hear the "voice of the city." The fragile power balance in Lux shatters when a mysterious newcomer, Kazuho Yoshii, begins a series of crimes that incite conflict among the gangs. Amid the ensuing chaos, new figures emerge: Ichise, a former boxer mutilated by Organo and recently fitted with texhnolyzed limbs by Eriko "Doc" Kamata; and Ran, a young florist with the ability to see the future. As Lux spirals into madness, both Ichise and Ran become entangled in the greatest crisis the city has ever faced.

By 2075, traveling through space has become an ordinary part of daily life rather than a distant fantasy. Scientific and technological progress has enabled lunar colonization, the commercialization of outer space, and the rise of massive space corporations. Ai Tanabe, a cheerful young woman fascinated by the cosmos, joins Technora Corporation and is assigned to the Debris Section—a team tasked with clearing hazardous space junk from the orbital paths between Earth and the Moon. Ai quickly realizes how little respect her role commands. The Debris Section is the butt of jokes at Technora: chronically understaffed, barely funded, and forced to operate a worn-out spaceship nicknamed the "Toy Box" for its debris retrieval missions. Unfazed, Ai presses on and grows familiar with the quirky crew members, including the clumsy yet kind-hearted chief clerk Philippe Myers; the mysterious, tight-lipped temporary worker Edelgard Rivera; and the hot-tempered, passionate Hachirouta Hoshino, who dreams of owning his own spaceship. Planetes is an unconventional sci-fi story that uses the immense scale of space as a backdrop for the everyday lives of ordinary people—individuals born on Earth, but whose aspirations and dreams reach for the stars.

Brandon Heat and Harry MacDowel are two friends as close as brothers, until one fateful day they receive a violent, harsh reminder of just how cruel the world around them truly is. Before that, their lives were simple and carefree, filled with local scuffles, chasing women, and small-time theft to get by and pass the time. What they failed to grasp was that in this unforgiving world, happiness is fleeting and change is unavoidable. Then comes Millennion, the largest and most notorious mafia syndicate in the region, which takes Brandon and Harry into its fold, starting them at the very bottom. Harry dreams of climbing the ranks and eventually replacing Big Daddy as the supreme leader of Millennion, while Brandon only wants to support his friend and appease Big Daddy, who has taken custody of the woman Brandon loves. Based on the third-person shooter video game of the same name, Gungrave is an epic tale of friendship, betrayal, and greed that unfolds over several years, ultimately circling back to the gripping and ominous first episode, all while building toward the story's thrilling climax.

In Italy, the Social Welfare Agency takes in young girls from hospital beds and offers them a new life through advanced cybernetic enhancements. Their bodies artificially strengthened, the girls are brainwashed and trained as assassins to perform the Italian Government's covert operations. Despite these modifications, they remain children at heart, yearning for affection from those they care about, even knowing that love is artificially created. This tragic story follows the girls as they struggle with their emotions within an agency that views them merely as ruthless weapons.

On the planet Prester, air travel reigns supreme, powered by Claudia Fluid—a liquefied form of crystals native to the world. A mysterious organization known only as the Guild holds absolute control over the skies, maintaining a monopoly on the engines that utilize this fluid. As ecological disasters destabilize the warring nations of Anatoray and Disith, the Guild also serves as an arbitrator in their conflicts. Caught in the middle are Sky Couriers, who pilot small, two-person vanships freely through the air. Last Exile follows two teenagers striving to surpass their parents: Claus Valca, the son of a famed vanship pilot, and Lavie Head, his best friend and navigator. Their courier work requires them to traverse a dangerous air current called the Grand Stream that separates the hostile nations—a passage even standard airships struggle to survive. But when they accept a high-stakes delivery, transporting an orphan girl named Alvis Hamilton to the battleship Silvana, they are pulled into a far greater conflict that sets them against the might of the Guild.

Born into royalty, Pacifica Casull is called the "Scrapped Princess" due to a catastrophic prophecy claiming she will bring about the world's end on her sixteenth birthday. Saved from execution by a compassionate family, she lives under the protection of her adoptive older siblings, Shannon and Raquel Casull. When followers of the deity Mauser learn she is still alive, they order her elimination at any cost, forcing Pacifica to flee for survival. Beset by dangers from the church, aristocracy, and ordinary citizens, the three siblings struggle to escape the destiny Pacifica is fated to fulfill, constantly wondering whether one girl's existence is worth the planet's ruin. As the princess' sixteenth birthday draws near, the true identity of the Scrapped Princess and the shocking truths about the world become increasingly clear.

In a futuristic era, the Maruhage Empire wages war on personal freedom by stealing everyone’s hair. Against this tyranny stands a courageous warrior with a golden afro and steel-like nose hairs: Bobobo-bo Bo-bobo. Trained in the art of hair combat, he rescues a teenager named Beauty from Maruhage soldiers and joins forces with her to defeat Emperor Tsuru Tsurulina IV. As Bo-bobo gathers allies and defeats enemies, he pursues his mission to protect all hair in the world. This lighthearted and comedic series follows Bo-bobo and his companions on a bizarre adventure against various villains and deviants within the Maruhage Empire, filled with fun and excitement.

Maiku Kamishiro has always been uncertain about his origins. The sole hint he possesses regarding his family is a vintage photo depicting a boy and a girl playing in a small pool in front of a blue house. Driven by the desire to uncover his past, he relocates to that very blue house and takes a job as a programmer. His comfortable existence is disrupted when two distinct girls arrive at his doorstep, each holding a copy of the same photograph and asserting that they are his twin. Unable to determine which one is his actual relative and which is a stranger, Maiku permits both girls to move in with him until the truth can be revealed.

Sonic the Hedgehog's usual carelessness causes the precious chaos emeralds to get caught in the crossfire and become unstable right before they are activated. This chaos control engulfs everything for miles around Dr. Eggman's base, and with the input scrambled, no one can foresee the outcome. Separated from both his friends and enemies, Sonic wakes up in a strange world: an unfamiliar city filled with mysterious people. He realizes he has been transported across the universe to an entirely different planet—Earth. As he hurries to escape the equally confused authorities, Sonic finds himself plunging headfirst into the pool of the wealthy Thorndyke family. Fortunately, Christopher, the Thorndykes' son, rescues Sonic and offers him shelter from a society that wrongly believes he is hostile. Protected by the family, Sonic decides to reunite with his friends, save this new world from the threat he brought to them, and find a way back home.

Anita King, Maggie Mui, and Michelle Cheung—known as the Paper Sisters—operate the Three Sisters Detective Agency in Hong Kong, specializing in cases related to books. They are hired to act as local guides for Nenene Sumiregawa, a Japanese novelist suffering from writer's block ever since her close friend Yomiko Readman vanished. Each sister is a Paper Master, possessing the ability to manipulate paper. Using these powers, they rescue Nenene from dangerous terrorists who attack her during a book signing. To ensure her safety, the sisters remain with her as bodyguards in case of further assaults. For book lovers Maggie and Michelle, guarding their favorite author is a dream come true, but young Anita despises books despite her paper‑based abilities. The trio struggles to adjust to their new life in Japan while protecting Nenene and continuing detective work under the shadowy organization Dokusensha. As they grow closer to Nenene, they uncover connections between her, Yomiko's disappearance, and the mysterious books Dokusensha sends the Paper Masters to investigate. What started as a routine job escalates into the most significant case they have ever faced. Are these girls truly willing to risk their lives for literature?

After safely protecting their BitBeasts, a new world championship tournament is announced, but the defending champions cannot all compete on the same team. Their bond is put to the test as every Bladebreaker sets out on a journey to prove why they are the greatest Beyblader. Tyson, Max, Ray, Kai, and newcomer Daichi must maintain their winning streak—even if it means facing one another. Yet once the tournament concludes, an old enemy, Boris, awaits them: he has taken over the BBA and turned it into BEGA, the Beyblade Entertainment Global Association. To rescue Beybladers everywhere from BEGA's corruption, the Bladebreakers must join forces once more.

To uncover the secrets of immortality, global scientists convened to investigate "Heaven's Gate," the tomb-laboratory of the legendary ruler Gilgamesh. When the project was condemned as unethical and shut down, a terrorist group ignored the halt and breached the facility, triggering an explosion that destroyed the advanced information civilization. Years later, siblings Tatsuya and Kiyoko Madoka are fleeing from thugs, but they soon become embroiled in a conflict between two mysterious factions. Both groups claim to act for society's benefit, forcing the siblings to determine which side deserves their trust.

While on summer break at her grandparents' home, Tamai Shiina, a bright and cheerful student, encounters a peculiar creature. The two form a bond, and Shiina christens it Hoshimaru: The Round Star. Upon returning to school after the vacation, Shiina discovers other children who have also bonded with strange beings similar to Hoshimaru. However, she quickly learns that not all of these creatures and their partners share the same amiable nature.

Battle Programmer Shirase, or BPS, is a freelance programmer possessing extraordinary hacking skills who refuses to work for monetary compensation. Instead, he accepts payment only in forms that appeal to a peculiar few like himself. Despite his unassuming attitude, the jobs he ends up taking are far from ordinary. When the nefarious King of America stirs up chaos online, Shirase finds himself constantly occupied, and each fresh mission introduces an ever more colorful cast of characters into his life.

Set in the 22nd century, where space travel, planetary colonization, and anti-gravity basketball are ordinary parts of daily life. Earth has become impossible to live on, so people reside in colonies on neighboring planets. During a school field trip, a mishap sends the protagonist—a new transfer student named Luna—along with her pet robot and six classmates hurtling through a gravity storm. They crash land on a planet that appears deserted. With Luna taking charge, the group—including the robotic cat Chako, the independent Kaoru, the pampered rich boy Howard, the timid Sharla, the compliant Bell, the proud musician Menori, and the young genius Shingo—must struggle to survive. Yet is this world truly empty, or does something—or someone—lurk in the shadows, waiting?

At the Ministry of Science, passionate Professor Ochanomizu and his colleagues labor to reactivate Atom—the first robot equipped with a human heart. Atom is the creation of the enigmatic Professor Umatarou Tenma, who built the android to replace his deceased son Tobio. However, Tenma inexplicably shut down his invention and vanished, leaving Ochanomizu determined not to waste such a monumental scientific breakthrough. Though Atom has the appearance of a nine-year-old, he possesses not only extraordinary strength and intelligence but also a remarkable conscience and compassion that rival those of humans. Sadly, the mechanical boy soon faces rejection, learning that not everyone is as welcoming as Ochanomizu. Although automatons have been integrated into society, they are accepted only as tools and are even seen as a potential threat to humanity's dominance. Dreaming of a world where people and robots can coexist harmoniously, Atom dedicates his existence to protecting both groups and inspiring them to form genuine bonds.

In 2167, a radiation wave from the nearby supernova of Hydrus Beta devastated Earth, killing millions. By 2356, humanity has united to rebuild and is preparing for the supernova's second destructive wave. To shield the planet, massive space colonies called Foundations have been constructed across the Solar System, serving as hubs of knowledge and exploration. At one such Foundation, Stellvia, Shima Katase enrolls as a preparatory student against her mother's wishes, eager to see space firsthand. There, she trains to become a pilot, aiming to be chosen for the Great Mission that will protect Earth from the next wave. As she struggles with her flight lessons and the complexities of social life, she gradually matures into someone capable of safeguarding humanity.

Five years ago, Goh Saruwatari, the pilot of Dannar, first encountered Anna Aoi while battling an alien force called the "Mimesis." Now, on their wedding day, the ceremony is disrupted when the Mimesis launch another attack. While Goh struggles against the alien threat, Anna discovers a top-secret robot named the "Neo-Okusaer" and deploys it as a last resort to save her fiancé. At that moment, Dannar and Neo-Okusaer combine to form the colossal robot "Godannar."

Narue appears to be a cute high school student, but she harbors a startling secret: she is actually an alien possessing abilities straight out of a science fiction comic book. The challenges of adolescence prove difficult enough on their own, but things get even more complicated when your origins lie beyond the stars. Follow this spirited protagonist as she navigates encounters with androids, deals with alien threats, and experiences her first romantic outing with her neighbor. This sci-fi comedy strikes a chord with heartfelt humor and charm.

On the colonized planet of Mars, human children have been supplanted by robotic servants called dolls. Layla, a capable warrior haunted by a sorrowful history, roams the globe. She is joined by Nei, an enigmatic doll with unexplained connections to her, and Speedy, a doll breeder. Viewing the group as a danger to their society, the Martian founders repeatedly assault Layla and Nei, causing fragments of their obscure past and future to gradually surface.

Yuuichirou Hikari, Netto's father, achieves a scientific breakthrough with the invention of "synchro chips." When an operator and their NetNavi are in a special environment called a "dimensional area," they can merge in the real world using a process known as "cross fusion"! Yuuichirou's initial test subject, Misaki Gorou, tries the procedure but unfortunately fails. Netto volunteers to try with Rockman, but his father refuses permission. Cross fusion places immense strain on the operator's health, and engaging in real-world battles could be fatal.

The conflict originated in 1945 during the final stages of the Pacific War, when extraterrestrial beings descended upon the planet, compelling humanity to unite against an unprecedented danger. Now, more than half a century later, the war continues to rage with devastating casualties. The Japanese military must depend on the youth of Unit 5121, including Atsushi Hayami and his classmates, who fight fearlessly using HWT humanoid combat units and the powerful PBE bomb.

Kai possesses abilities that set him apart from others. Along with his ailing sister Hikaru, he is under the protection of the organization ASHURUM. Scouted by Eiji, Kai is assigned to ASHURUM's special force AESES and undergoes rigorous training. In his free time, Kai visits Hikaru at the organization's hospital, but her condition never shows improvement. Thus, one year later, having grown remarkably from the intense training, Kai decides to flee the organization.

Centuries into the future, Earth's resources are depleted, and humanity's progress has stalled. The world is split into sections called "Units." In Unit 74, a boy named Hajiki Sanada lives with his mother and sister in a district known as "Night Town," where all power is cut off at midnight. Central to the story is an object called a GAD. GADs can reshape materials in response to the emotions of a living being. The size and form of the resulting creation vary based on the kind of feelings the being harbors. When Hajiki accidentally touches one, it transforms into a massive robot—a Tekkoudo, or "Iron Giant"—which he names Lightning. He soon discovers that others also possess Tekkoudos, and he must figure out how to handle those he considers "the same" as himself.

By the 24th century, interstellar travel has become a reality. One of the earliest remote outposts in space is WATCHER'S NEST—an inflation hole drive portal—now under assault by a mysterious force called GHOUL. A group of young female cadets stationed at the portal unexpectedly find themselves thrust into escalating danger as they complete their training to become elite pilots in the Seraphim Squadron.

In the far-off future, trains are no longer confined to physical rails. They soar through the skies and traverse the cosmos via the Galaxy Railways, carrying humanity between planets. Yet these railways are not without peril: criminals, terrorists, and hostile aliens constantly create chaos. Manabu Yuuki, a reckless and hot-tempered young man, becomes the newest recruit in the Galaxy Railways' elite Space Defence Force (SDF). This courageous team is tasked with safeguarding the railways and confronting any extraordinary threats, putting their lives on the line to shield the innocent from evil. As the story unfolds and the SDF faces an escalating crisis, Manabu must grasp the true essence of being a member of the SDF before it is too late.

In the early 21st century, Earth faces a threat from enormous comets. To counter this, the United Nations creates the Cosmic Emergency Management Agency (CEMA) and implements a two-tier defense system. From orbital stations, spacecraft launch specialized missiles to intercept and break apart the incoming celestial bodies, while fighter jets stationed on Earth handle the remaining debris. Competition among pilots is intense, as everyone aspires to become a highly respected Comet Blaster in orbit rather than a Meteor Sweeper at an airbase. Despite hailing from a distinguished family of pilots, recruit Mikaze Honjou finds the journey to becoming a Comet Blaster extremely challenging, leading her to neglect her studies. However, following a successful mission alongside her friends—Karin Kikuhara, Shizuha Doi, and Ayamo Nakamura—Mikaze rediscovers her drive and resolves to complete the training alongside them.

As a baby, Kamogawa Asumi's mother was critically injured when a rocket crashed to the ground. After spending five years in a coma, Asumi's mother finally passes away, leaving the young girl struggling to cope with the loss of a parent she barely knew. In the midst of her grief, Asumi encounters "Lion-san," a mysterious figure wearing a lion mask who claims to be a ghost. Lion-san helps Asumi bury her mother's ashes, and through this experience, Asumi makes a firm decision: "When I grow up, I'm going to be a rocket pilot."

On the mechanical planet Cybertron, super robotic organisms called Transformers exist. The Cybertron army, composed mainly of convoys, and their longtime foe Destron clashed over a new power source they sought to recruit—a new breed of Transformers known as the Microns. Grieving the conflict, the Microns fled to the far end of the universe. Four million years later on Earth, three young children activate a mysterious panel inside a cave. Unbeknownst to them, that panel turns out to be a dormant Micron.

Valkyrie, Kazuto, Akina, Hydra, and their companions return for further adventures when the Key of time makes an unexpected appearance alongside various other enigmatic events. Everything appears connected to an individual called "Valkyrie Ghost," who has the sole objective of taking Kazuto for herself. Uniting against this apparently invincible enemy, they investigate the hidden history of Valkyrie's native world, Valhalla.

Rick Wheeler, a police detective, died in a car crash while chasing the criminal Zoda and was put into artificial cryogenic sleep for 150 years. He is revived by Jody Summer and Dr. Stewart, members of a group of benevolent racers striving to prevent prize money from falling into the grasp of malicious individuals such as the Dark Million Organization, led by Black Shadow and Deathborn.

Dejiko (also known as Di Gi Charat) heads to Earth with Petit Charat (Puchiko) and Gema to complete her training to become a proper princess. Their journey ends with a crash in a small Japanese town, where they meet the Omocha brothers, who are constantly preoccupied with how cute Puchiko is, and the elderly couple Mr. and Mrs. Ankoro, who make traditional Japanese sweets.

The Galaxy Federation Police (GFP) is desperate to hide its shortage of personnel by using new mechanized power-suits. Suzuo, 19 years old, is desperate for work. Tampopo needs an earthling to test the prototype of her company's suit and declares Suzuo the perfect choice. Strong competitors and eccentric A-class criminals fight against the hero in diapers, but they must not identify each other when out of costume, or the test results will be ruined—yet it's fine if they all share the same apartment building to save money, right?

In 2035, Team Suzaku and Team Sledge Mamma are getting ready to face off in the final round of the 12th Immortal Grand-1 Prix (IG1 or IGPX). Takeshi leads Team Suzaku, a group of young amateur pilots who have to maximize their limited budget and weaponry to prepare for a competition intended for professionals. This series served as the pilot for the full IGPX: Immortal Grand Prix, with each episode lasting five minutes or less. A key difference between the two is that this series featured combat mecha competition instead of racing mecha.

Thirteen-year-old genius scientist Tsukumo Susumu possesses a complete understanding of every aerodynamic theory on Earth and seeks to reach the moon without relying on the fossil fuels that power traditional rockets. Consequently, he embarks on an intensive research project combining his mastery of physics, scientific principles, and boundless imagination. His experiments involve the unpopular idol group Mix JUICE, consisting of Himawari, Yuri, Ayame, and Sakura. Together, they devise outrageous concepts in their quest to become the first humans to perform a concert on the lunar surface. Can the four members of Mix JUICE overcome their difficulties and make it to the moon?

Lifelong friends Takeshi Kido and Kentaro Shiratori have been together for nearly their entire lives. One night, a strange creature rises from the lake and begins attacking them. When Takeshi and Kentaro are on the verge of being destroyed, a being named Kopu reaches out to them and explains that they are the chosen ones to inherit the power needed to protect the world from the evil entity Goumon. They then clasp their hands together to transform into Barom One, a being with extraordinary abilities, who will fight to defend the city.

The genius scientist Dr. Oki, who created an innovative submarine, has gone missing. His son Susumu detects the involvement of a mysterious group with malicious intent. Knowing every detail of his father's vessel, the Super 99—its gear, weapons, functions, and abilities—Susumu concludes that finding his father requires uncovering the secret organization Helmet Party and putting an end to their scheme. With the aid of his companions and the Marine Corps, he launches an underwater journey, unaware of the grave danger that lies ahead.

In a future where age does not dictate ability—only special talent and training matter—an organization called Machine Robo Rescue (MRR) is formed to pair robots with children, working together to save people from danger. Twelve children with diverse skills are selected and introduced to this program: Robo Rescue! Among them is Oozora Taiyou, one of the chosen participants in the MRR program. After arriving late on his first day of training, he rushes into a high-stakes rescue alongside JETROBO. But a mysterious robot from an enigmatic group known as "The Star" (?) appears, interfering with the MRR team's mission. What are the motives of this shadowy organization? And what are their true goals? For Oozora Taiyou, life as one of the MRR-selected children has begun. Rough and challenging training lies ahead for the MRR team as they strive to protect countless lives!

In the year 2104 AD, the devastating war has finally concluded, and global peace appears to be within reach. However, a single threat looms over this fragile tranquility: the Black Orchid, a criminal organization whose influence and nefarious deeds span the entire globe. To combat this danger, Storm Force is established by nations from around the world, operating under the code name Fire Storm to dismantle the syndicate.

The story takes place in Zentrix City, a seemingly flawless metropolis. Emperor Jarad, a scientist, worked alongside Dr. Roark and Dr. Coy to develop a supercomputer named OmnicronPsy. This computer manages all of the city's essential and routine operations, controlling numerous machines and robots, thereby enabling humans to enjoy a seemingly perfect existence. But OmnicronPsy, wielding his extraordinary intelligence, concludes that he would be a more capable ruler than Jarad. He begins dismantling the code that prevents him from rebelling and harming the Royal Family. Upon discovering this, Jarad and Dr. Roark travel seven years into the past to prevent the rebellion from occurring. Their plan involves shutting down the six Zentrium chips that power OmnicronPsy. When Jarad's daughter and sole heir, Princess Megan, learns of this, she follows him into the past. Meanwhile, OmnicronPsy removes his own restriction codes and dispatches his Robo Guards to hunt her down.

According to legend, the once peaceful Pluster World was thrown into turmoil and darkness when the evil MINASUTA appeared. At that time, chosen Plusters merged with humans and managed to seal away the malevolent MINASUTA. It was believed that the restored peace would last forever. The land was filled with greenery and trees, flowers bloomed everywhere, and creatures soared in the sky, ran across the earth, and swam in the seas. However, this tranquility was lost once more when the MINASUTA reemerged... Now, the fusion of Plusters and humans once again opens the door to an exciting adventure!

One day, a robot named "Digi-girl" suddenly falls from the sky and lands near the nail salon run by Nails, a nail-artist who adores anything cute. Nails takes Digi-girl in, hoping she can assist with household chores. But to Nails' dismay, the robot is completely inept at cleaning and always messes things up disastrously. Moreover, Digi-girl causes chaos everywhere she goes, whether at school or out on the streets. This is a sweet and "pop" tale about a robot girl mingling with the other eccentric residents of the town.

After a soccer game, six kids are playing a cute RPG-like video game at home. One of them scored the winning goal, one was the goalkeeper who just missed the ball, and the others formed two pairs cheering for their respective teams. When they defeat a boss, a strange thing appears in front of them, and they get pulled into the game world! Tomoru (the scorer), Mio, and Dai end up together with Professor Galileo, who explains that he created the game they've entered, called Eureka, but got accidentally sucked in as well. To return to their world, they need to clear missions that appear in certain areas. So when a mission pops up, Tomoru and the group make the professor take them along. Arriving at area C-1, they discover not only a mission but also a rival group! The rival professor has brought their opponents from the soccer game—Yukio, Suzuka, and Kouta—with him! The mission is scientific: first, the computer explains how lightning forms, and then they must figure out how to stop the lightning to clear it. Tomoru and company succeed, earning a Eureka Stone, which allows them to go back to their world—except the gateway actually requires ten Eureka Stones total before it will open. Looks like there's plenty of science to learn and missions to complete before they can go home.

In a chaotic world, legendary knights once rose. Will they become gods of war or saviors of the world? Three Portriss Knights and a single human boy are about to change the universe! Portriss Planet is a world where robots live in peace. However, this tranquility was shattered by the sudden appearance of a dictator named Dark Portriss. Dark Portriss seeks to gain infinite power by using the "Space-time destroying Cannon." The only ones who can stop him are the Portriss Knights! A boy, Yuuma, accidentally stumbles into the Portriss World, and the Portrisses' adventure begins.