Manga Like Middle-Aged Man Overpowers with Guns in the Another Universe.

Guts, once known as the Black Swordsman and a mercenary, pursues a path of vengeance. After enduring a brutal childhood, he finds someone he can trust and respect, but that bond is shattered when that person betrays him, stripping away everything precious to him in pursuit of their own ambitions. Now marked for death, Guts faces unrelenting persecution from dark forces. Driven by a grim and tragic mission, wielding immense strength and a colossal sword, he pushes forward undeterred by any obstacle, even death itself, until he can confront the one who stole his and his lover's humanity. This synopsis also includes a one-shot titled "Berserk: The Prototype," featured in Volume 14.

In Chainsaw Man, Denji longs for a simple life with the girl he loves, but his hopes are crushed when the yakuza force him to hunt devils to repay an enormous debt. Using his devil companion Pochita as a weapon, Denji does whatever it takes to earn the money he needs. However, his fate takes a sudden turn when a devil working for the yakuza kills him, seeing him as expendable. To Denji's shock, Pochita merges with his dead body, granting him the powers of a chainsaw devil. Able to transform parts of himself into deadly chainsaws, the revived Denji cuts down his enemies with brutal efficiency. His new ability soon catches the attention of professional devil hunters, leading to his recruitment by the Public Safety Bureau. Despite his enhanced power to face the most dangerous threats, Denji still clings to his childhood dreams.

The infamous Pirate King, Gol D. Roger, is executed by the World Government. Before his death, he reveals that a legendary treasure called One Piece is hidden somewhere in the Grand Line. He declares that whoever finds it will become the next Pirate King, sparking the Great Age of Pirates. Twenty years later, Monkey D. Luffy, a young aspiring pirate, begins his own journey to find One Piece and claim the title of Pirate King. With only a straw hat, a small boat, and his rubber-like body, Luffy sets out to gather a crew and find a ship strong enough to sail the dangerous Grand Line, aiming to reach the top of the pirate world.

In a world where "the Gate" appeared ten years ago, linking reality to a magical realm full of monstrous beings, ordinary people gained extraordinary powers and became known as "Hunters." Among them is Sung Jin-Woo, a 20-year-old Hunter called the "World's Weakest" due to his exceptionally feeble abilities even at E-Rank. Despite his struggles, Jin-Woo persistently hunts monsters through low-tier Gates to pay for his mother’s medical expenses. His life changes drastically during a disastrous mission, where he thinks he has died alone. However, he wakes up three days later in a hospital and encounters a strange floating screen—the "Quest Log"—which orders him to complete an extremely intense training program, threatening harsh consequences if he fails. Though initially hesitant because of the daunting challenge, Jin-Woo realizes this could be his chance to become one of the strongest Hunters in the world.

In the hidden corners of Tokyo, monstrous beings called ghouls prey on humans under the cover of darkness. To combat these threats, an agency named the Commission of Counter Ghoul (CCG) was established with the mission of eradicating ghouls. However, identifying ghouls is challenging since they seamlessly integrate into human society. Ken Kaneki, a typical university student, unwittingly becomes embroiled in the human-ghoul conflict when his date reveals her true ghoul identity, intent on consuming him. Rescued from near death and hospitalized, Kaneki discovers that the surgical intervention has transformed him into a half-ghoul. Desperately seeking to quench his insatiable craving for human flesh, he finds refuge with compassionate ghouls who run a café, aiding him in adapting to his altered state. Believing he can lead a quiet life, Kaneki is unaware that his presence will soon ignite a conflict between his new companions and the CCG, and that his new form has caught the attention of other ghouls throughout Tokyo.

Tanjirou Kamado lives in a remote mountain village with his family, who are struggling financially. After his father's death, he takes on the role of providing for the household. One cold winter evening, Tanjirou goes to a nearby town to sell charcoal. As night falls, he stays overnight at the home of a strange man who warns him about dangerous creatures that appear after dark: malevolent demons that feed on human flesh. Returning home late, Tanjirou discovers a horrifying scene. His family has been brutally murdered, except for his sister Nezuko, who has become a demon that consumes people. Overcome with grief and anger, Tanjirou vows to protect others from Nezuko while seeking revenge for his family and finding a way to restore his beloved sister to human form.

In the Hidden Leaf Village, Naruto Uzumaki aspires to become the Hokage, the village's strongest ninja. His dream is met with skepticism from the villagers, who have always treated him harshly. This mistreatment stems not from Naruto's loud personality or his early difficulties as a ninja, but because he carries a powerful demon within him—the Nine-Tailed Fox, sealed inside him at birth by the Fourth Hokage to protect the village from its destruction. Assigned to Team 7 alongside Sasuke Uchiha and Sakura Haruno, and led by the experienced ninja Kakashi Hatake, Naruto embarks on a journey that forces him to collaborate with others for the first time. Through intense training and dangerous missions, Naruto discovers the true value of teamwork and works to forge his own path toward becoming a respected ninja acknowledged by his community.

Two years after the CCG's assault on Anteiku, Tokyo has seen a sharp rise in the organization's authority. Even so, ghouls remain a threat, especially as they've grown more cautious. The Aogiri Tree terrorist group has adapted to the CCG's increasing danger. In response, the CCG forms the Quinx Squad, an elite team of humans who undergo surgery to wield ghoul-like abilities, tasked with hunting these creatures. Leading them is Haise Sasaki, a hybrid of ghoul and human, trained by special class investigator Kishou Arima. Beneath his calm exterior, Haise carries hidden memories that slowly surface, hinting at his former identity.

In a world where alchemists can alter and transform matter through their expertise, these practitioners are esteemed for their knowledge and abilities. Yet, despite alchemy's immense power, it cannot accomplish everything—especially human transmutation, which is forbidden due to its severe repercussions. Disregarding these warnings, the brothers Edward and Alphonse Elric attempt to bring their deceased mother back to life through human transmutation. The attempt ends in catastrophe: Edward loses his left leg, and Alphonse loses his entire body. In a desperate move, Edward sacrifices his own right arm to bind Alphonse's soul to a suit of armor. Time passes, and the two brothers set out on a journey across the nation in search of the Philosopher's Stone, hoping to regain their original bodies. Their quest, however, reveals far darker truths than they ever anticipated.

The allure of hidden treasures, undiscovered riches, and untapped frontiers draws in those captivated by the unknown, people known as Hunters. Driven by the dream of locating his father, a man who abandoned him for a life of adventure, Gon Freecss sets his sights on becoming a Hunter. The journey is fraught with challenges; only one candidate out of a hundred thousand typically succeeds in passing the Hunter Exam, which is just the beginning. Along the way, Gon forges bonds with other aspirants like the enigmatic Killua, the vengeful Kurapika, and Leorio, who seeks to become a doctor. Ahead lies a world filled with both excitement and peril, where those who embrace the adventure can ascend to become the greatest Hunters.

In a world where magic is woven into the fabric of existence, Asta, a loud and energetic orphan, is born without any magical power. Yet he aspires to become the Wizard King, the highest rank a mage can achieve in the Clover Kingdom. His childhood friend and rival, Yuno, wields formidable wind magic, setting them apart despite their shared dream. Facing this vast gap, Asta subjects himself to grueling physical training every day, hoping to unlock any latent magical ability and close the distance between them. At age 15, citizens of the Clover Kingdom receive a Grimoire, a vital tool for fully harnessing their magic. During the ceremony, Yuno obtains a Grimoire adorned with a legendary four-leaf clover, signifying immense power, while Asta is left without one. Overcome with disappointment but refusing to give up, Asta witnesses Yuno being abducted by a mage who seeks to steal Yuno's unique Grimoire. Though utterly outmatched by Yuno's captor, Asta's unyielding determination to fight back ultimately grants him his own Grimoire—one marked by an unprecedented black five-leaf clover.

In the midst of the Middle Ages, people live in perpetual fear and suspicion, with the term "Yoma" spoken in hushed tones. These monstrous beings are known for their insatiable hunger for human flesh and their terrifying ability to transform and assimilate the memories of those they consume, turning everyone into a possible enemy. The sole defense against Yoma are the warrior women known as "Claymore," who are part-human and part-Yoma themselves. Sent out to eliminate Yoma from afflicted villages, their lives are solitary and dangerous, with each assignment potentially being their final one. Between missions and lengthy travels, they battle their own Yoma tendencies to maintain their humanity. Despite their crucial role, the villagers they protect do so begrudgingly and view them with disdain. The story centers on Clare, a disciplined and low-ranked Claymore, as she embarks on a challenging journey driven by a personal vendetta. Throughout her odyssey, she uncovers hidden truths about the world, including the bonds and optimism among her fellow Claymores and the dark secrets concealed within the Claymore Organization.

For years, Twenty-Fifth Bam lived a solitary life until he met Rachel. With her decision to climb the Tower firmly set, Rachel prepares to leave Bam behind to chase her ambition. Following Rachel through a radiant barrier, Bam begins his journey to ascend the Tower, driven by his wish to reunite with her. The Tower, however, is a treacherous realm filled with ancient mysteries, formidable creatures, and hostile individuals. Each floor is overseen by an Administrator who imposes rigorous trials on those brave enough to face them, pushing their limits to the extreme. When confronting Headon, the Administrator of the first floor, Bam learns he is classified as an "Irregular"—someone who entered the Tower without being chosen by it, an exceptionally rare occurrence. Even with this revelation, Bam's path forward remains unwavering. Whether it be riches, strength, fame, or reunion with Rachel, the summit of the Tower promises to fulfill every desire.

In Death City, the Death Weapon Meister Academy, founded by Shinigami the Grim Reaper, serves as a bastion of order. The academy trains Meisters and Demon Weapons—humans who can transform into weapons—to defend humanity from evil forces. The ultimate goal for a Meister is to forge a "Death Scythe" fit for Shinigami, which requires their weapon partner to consume the souls of 99 evil humans and one witch. Maka Albarn and her weapon partner, Soul Eater "Soul" Evans, are students at the academy striving to achieve this. Their journey includes the loud Black☆Star and his flexible partner, Tsubaki Nakatsukasa, along with the precise Death the Kid—known simply as Kid—and his twin partners, Patricia "Patty" and Elizabeth "Liz" Thompson. Each team aims to be the best Meister and Demon Weapon pair, facing various missions, challenges, and academic trials along the way. Despite their goals, the group becomes entangled in numerous mysteries. As new enemies emerge and hidden secrets are uncovered, Maka, Soul, and their friends must confront threats far greater than ordinary human foes, fighting to protect both the academy and the world.

In the grim and chaotic district known as Hole, where darkness and decay reign supreme and survival is a constant struggle, the powerful magic users hold absolute sway over a populace they regard as mere insects. The streets are rife with violence, and the hospitals overflow daily with the victims of murder, mutilation, and ruthless experimentation. Amidst this desolate landscape, a few dare to challenge the magic users' dominion. One such figure is Caiman, a creature more akin to a reptile than a human, driven by a relentless pursuit of truth. Equipped with two trusted bayonets and blessed—or cursed—with immunity to magic, he stalks through Hole, haunted by his own appearance and plagued by nightmares. His sole allies against these malevolent sorcerers are his insatiable appetite and Nikaidou, the proprietor of the diner Hungry Bug, who stands steadfast beside him. Dorohedoro unfolds in a nightmarishly designed world, blending dark humor and light-hearted moments with unflinching depictions of brutality and death. Through the tangled lives of Hole’s inhabitants, the series crafts a singular universe of eerie origin and bleak aesthetics, unsuitable for the faint of heart.

In Noragami, Yato is a minor deity with no followers who scrapes by doing odd jobs for five yen, hoping one day to afford his own shrine. His situation worsens when his Shinki, his weapon companion, leaves due to their dire circumstances. Without a weapon, Yato continues taking odd jobs while searching for a new Shinki. While hired to find a missing cat, Yato gets into danger chasing it and is saved by a girl named Hiyori Iki, who pushes him out of the way but ends up injured herself. In the hospital, Hiyori discovers her soul has become separated from her body because of the accident. Feeling responsible, Yato vows to help fix her condition—all for five yen. To do so, he must acquire a new Shinki, which turns out to be the defiant spirit Yukine. The series follows a young woman navigating life between the spiritual and physical realms, and a forgotten god trying to find his place in the world.

In a world where giant, Godzilla-like monsters called "kaijuu" regularly threaten Japan, the Defense Corps serves as the primary force protecting the nation from these colossal dangers. After a kaijuu is defeated, the Professional Kaijuu Cleaner Corporation dispatches "sweepers" to handle the cleanup. Kafka Hibino, a 32-year-old sweeper, feels dissatisfied with his job. He once dreamed of joining the Defense Corps and fighting kaijuu, but after repeated failures, he settled for a steady cleaning position. His perspective shifts when Reno Ichikawa, an 18-year-old determined recruit, joins his team and reignites Kafka's old ambitions. A series of unfortunate events, combined with an encounter with the young sweeper, leads Kafka to be invaded by a parasitic kaijuu that enters through his mouth, turning him into a humanoid monster. With his new powers, Kafka decides to pursue his long-held dream once more.

In "Hell's Paradise: Jigokuraku," Gabimaru, a legendary emotionless ninja from Iwagakure Village, is sentenced to death after being betrayed by his own comrades. Weary from a life of violence and deception, he has accepted his fate. Yet, every attempt to execute him fails because deep down, Gabimaru harbors a hidden desire to survive—to reunite with his wife, the one person who softened his heart and caused his downfall as an assassin. Seeing this will to live, Asaemon the Decapitator, a skilled executioner, offers Gabimaru a deal. In exchange for joining a mission to a mysterious island south of Japan in search of the elixir of life, the Shogunate promises him a full pardon. The island, thought to be a paradise, conceals many dangers, and the team of condemned criminals sent to explore it may not be ready for what awaits them.

In the shadow of a naive young Emperor, Minister Honest wields power with brutal indifference, exploiting the populace and corrupting the capital city. This tyranny fosters a world where the elite abuse their authority at the expense of the vulnerable. To combat this oppression, the Revolutionary Army has formed Night Raid, a covert group of lethal assassins dedicated to eliminating those responsible for and complicit in the Empire's atrocities. Tatsumi, a simple youth wielding a sword, journeys to the capital with the aim of rescuing his destitute village. Upon arriving, he is confronted with the harsh realities of the city's violence and injustice. Driven by his newfound rage, Tatsumi is drawn to Night Raid's righteous cause and opts to join their ranks, setting out on a perilous quest for retribution against Minister Honest. Through his trials, Tatsumi grapples with complex moral questions and the harsh truths of life and death, striving towards a vision of a more just society.

In Dragon Ball, a determined 16-year-old named Bulma sets out to find the seven mystical Dragon Balls, which can fulfill any wish when gathered. Her ultimate goal is to wish for the perfect boyfriend. On her quest, she meets Gokuu Son, a powerful young man who has lived in isolation most of his life. Gokuu possesses one of the Dragon Balls, inherited from his deceased grandfather, and agrees to accompany Bulma in exchange for it. Through their journey together, Gokuu discovers a world vastly different from what he knew before. Numerous foes are also after the Dragon Balls, compelling Gokuu to constantly improve his abilities to safeguard Bulma and the friends they make along the way. However, Gokuu conceals a significant truth about himself; his extraordinary strength stems from a hidden past that poses a threat to those he cares about. As Gokuu’s martial arts prowess grows, he faces increasingly formidable opponents with sinister intentions. Committed to protecting his loved ones and the future of the planet, Gokuu dedicates himself to relentless combat training, ready to face any challenge that comes his way.

In the story "Omniscient Reader's Viewpoint," Kim Dokja, whose name reflects his solitary lifestyle, has devoted his life to reading web novels, especially *Three Ways to Survive the Apocalypse* (TWSA). For over a decade, he has vicariously experienced the journey of Yoo Joonghyuk, the protagonist who repeatedly loops through time, battling deadly scenarios orchestrated by divine beings called "Constellations." After reading 3,149 chapters—long after everyone else abandoned the series—Dokja believes the story has finally ended. Then, without warning, he receives a mysterious message from the author announcing a shift to a paid service, and his world goes dark. Dokja realizes he is now inside the web novel, living through its scenarios. As the only omniscient reader who knows the plot as it unfolds, he must navigate these dangerous events, possibly taking on the role of protagonist—a position he never imagined he would fill.

Long ago, six meteorites struck Earth, creating six moons and leaving only a single island intact. Those who failed to reach this island were submerged in the ocean and, over immense spans of time, transformed into crystals. Eventually, 28 of these crystalline beings, called the Lustrous, emerged to live on the island. Guided by the wise Kongou-sensei, they defend themselves against the relentless Lunarians, moon-dwellers who seek to use the gems' bodies for weapons and ornaments. The story focuses on Phosphophyllite, a gem nearly three centuries old. Known for being clumsy, extremely fragile, and lacking any notable abilities, Phosphophyllite is among the weakest of the Lustrous, struggling to make a meaningful impact in the battles against the Lunarian invaders. However, as the conflict continues, Phosphophyllite discovers that strength often comes with a heavy price that no one should have to bear.

In ancient times, certain individuals were granted divine powers to fight against evil entities known as "Akuma," which hide in darkness. These Akuma, controlled by the Millennium Earl, seek to destroy the "Innocence"—the only weapons capable of harming the Earl and his minions—and bring about the Great Flood that occurred a hundred years ago. To prevent this catastrophe, the Black Order was established to oppose the Earl. The Order recruits Exorcists, individuals who can naturally resonate with Innocence, to engage in battles against Akuma. Set in the late 1800s, Allen Walker, a youth with white hair and an Innocence that manifests as his left arm, along with a cursed eye that reveals Akuma, joins the Black Order. At the Order, he meets his fellow comrades: the tempestuous Yuu Kanda, the empathetic Lenalee Lee, and the cheerful yet mysterious Lavi. Despite their differing personalities, they unite with the common goal of saving the souls trapped within Akuma and stopping the Earl's plan to destroy the world.

In the shadowy depths of the English countryside lies the Phantomhive estate, a place notorious for its cold and merciless reputation as the "Queen's Watchdog" and the leader of London's criminal underworld. Following a tragic incident that claims the lives of the Earl and his wife, their young son, Ciel, unexpectedly assumes the role of the new Earl. Though initially perceived as merely a child with peculiar servants, it soon becomes clear that defying Ciel and his enigmatic butler, Sebastian, is unwise. Set against the backdrop of the late 19th century, Black Butler chronicles the duo as they navigate numerous mysteries and threats that plague England and endanger the Queen, all the while piecing together the mystery surrounding the death of Ciel's parents.