Best Ecchi Anime of 2013

After her father is killed, Ryuuko Matoi travels across the country seeking his murderer. Her only clue is the missing half of his creation, the Scissor Blade, which leads her to Honnouji Academy, an elite high school unlike any ordinary institution. The academy is controlled by the stern and merciless student council president Satsuki Kiryuuin and her formidable subordinates, the Elite Four. Within the school's cutthroat ranking system, Satsuki grants top-performing students special garments called "Goku Uniforms," which bestow unique superhuman abilities. Defeated soundly in a fight against a uniformed student, Ryuuko returns to her destroyed home and discovers Senketsu, a rare sentient "Kamui" (God Clothes). When Senketsu comes into contact with Ryuuko's blood, it awakens, attaching itself to her and granting her immense power. Armed with Senketsu and the Scissor Blade, Ryuuko confronts the Elite Four, determined to reach Satsuki and uncover the truth behind her father's murder once and for all.

Issei Hyoudou, the high school pervert and future Harem King, finds his adventures continuing in High School DxD New. While the Occult Research Club goes about its usual routine, it becomes clear that something is amiss with their Knight, Yuuto Kiba, who has lost his usual composure and alertness. Issei soon uncovers the dark and bloody history of Kiba, linking it to the enigmatic Holy Swords. Once the victim of a cruel experiment, Kiba now desires vengeance against those who harmed him. With the return of a familiar foe and the arrival of two new beauties wielding Holy Swords, Issei and his Devil allies are once again dragged into a sinister scheme.

Kojou Akatsuki's ordinary high school existence on Itogami Island's Demon District is turned upside down when an accidental encounter gives him the formidable abilities of a vampire. This new power rapidly attracts significant attention, identifying him as the Fourth Primogenitor—a legendary and fearsome vampire thought to be nothing more than a myth. Concerned by the potential devastation he could cause, the Lion King Organization dispatches Yukina Himeragi, a trainee sword-shaman, to monitor him closely and terminate him if he becomes hostile. Bound by obligation and circumstance, the two form a tentative alliance as Kojou struggles to master his newfound abilities, and together they strive to protect the city from an escalating series of chaotic dangers.

The Neighbor's Club, founded to help lonely students make friends, remains a sanctuary for its unlucky members. Even after a major incident at summer's end, Yozora Mikazuki and the group return to their usual routine. But the arrival of a strange nun, student council members, and other newcomers adds fresh complications, making Kodaka Hasegawa's schedule more chaotic than ever. As the club takes part in typical high school activities—visiting amusement parks, playing games, and preparing for the school festival—the relationships among the members gradually evolve. This marks the start of a new chapter in their heartfelt yet awkward coming-of-age love comedy.

Second season of Infinite Stratos.

The Walpurgis Royal Academy of Machinart was established alongside the creation of "Machinart," a form of machine magic that grants life and intelligence to mechanical dolls, known as "automatons." Its purpose is to train skilled puppeteers capable of controlling these automatons, as global militaries have started integrating Machinart into their forces. After failing the academy's entrance exams miserably, Raishin Akabane and his humanoid automaton Yaya must defeat one of the top one hundred students to earn the right to participate in the Evening Party, a battle for supremacy among puppeteers using their automatons. The last competitor standing receives the title of "Wiseman" and gains access to the powerful forbidden arts. To this end, Raishin challenges Charlotte Belew and her automaton Sigmund to a duel, but before the match begins, Sigmund is attacked by other students. After rescuing his opponents from their attackers, Raishin cancels the duel and is forced to find another way to enter the Party. Driven by the tragedies of his past, Raishin fights alongside Yaya to climb to the top and achieve the title of Wiseman.

Raul Chaser once dreamed of becoming a hero and defeating the Demon King, so he enrolled in the Hero Training Program to pursue that goal. But when peace returns to the world after the Demon King's defeat, the program gets suspended indefinitely, making it impossible for anyone to become a hero. Two years later, Raul grudgingly works at a small electronics store called Magic Shop Leon. The former hero-in-training is frustrated by the dullness of retail work, but everything shifts when a new employee arrives. At first, this person appears to be just a handsome boy, but "he" is actually a female demon named Fino Bloodstone. And she is no ordinary demon—Raul's new coworker is the daughter of the late Demon King. Tasked with training this eccentric recruit, Raul soon finds his life becoming far more lively than ever before.

After the 10th NOVA battle, the Chevalier determined that the NOVA are appearing more frequently and that they are losing Pandoras faster than they can create new ones. Their answer is the E-Pandora Project, which grants ordinary humans the ability to become Pandoras. Pandoras from across the globe are invited to the Alaskan base to witness the unveiling of this new initiative, with Satellizer, Kazuya, and Rana among those summoned. But as time passes, the E-Pandora Project begins to seem increasingly suspicious, and the Pandoras' worries continue to grow.

At Winford Academy, situated in the historic town of Helen's Hill, the focus is on knights and the sport of jousting. Students at this school train to become knights, learning proper horsemanship and jousting techniques. The protagonist, Takahiro Mizuno, once trained to be a knight and jouster himself, but after sustaining an injury, he left the knight program and joined the begleiter (assistant) program instead. His skill with animals and previous jousting experience make him highly sought after, and many beautiful girls at the school ask him to be their personal begleiter, though Takahiro consistently turns them down. One day, an unusual accident leads to his friend, Mio Kisaski, being challenged to a jousting duel, even though she is not a knight. Takahiro agrees to serve as her temporary begleiter, but this arrangement proves to be just the start of their partnership when she enters the annual tournament.

Within the prestigious walls of Hanzo Academy, a chosen few secretly train to become ninjas belonging to an elite group called the Shinobi Masters. Determined to follow in her grandfather's path, the hopeful Asuka undertakes this rigorous training alongside her unique circle of friends: Ikaruga, Katsuragi, Yagyuu, and Hibari. They tirelessly study the hidden ninja arts, sharpening their abilities with the goal of one day becoming fully-fledged kunoichi. Senran Kagura follows these girls as they bravely fight against a mysterious new threat that terrorizes Hanzo Academy. Clad in tight outfits, they must demonstrate their worth and defend the academy from its enemies before it is too late.

High school student Kazuya Maeda feels his everyday existence is dull and pointless. That changes just before summer break ends when he gets an old camera from his father. Though hesitant at first, Kazuya decides to try his hand at photography and begins searching for girls willing to pose for his shots. Several girls offer to model for him: Haruka Niimi, his popular childhood friend; Nonoka Masaki, the star pitcher of the softball team; Aki Muroto, the student council president; Hikari Sanehara, another photography lover; Tomoe Misumi, his shy classmate; Rina Yunoki, the sole member of the Cooking Research Society; and Mai Sakura, a friend of his sister. As he pursues this new interest, Kazuya finds each day growing more lively and meaningful. Yet his ongoing interactions with these girls make him wonder whether they want a place in his life beyond his camera lens.

Second season of Hyakka Ryoran: Samurai Girls.

For five years, the Manifestation Engine on Blue Island has solved the global energy crisis. Meanwhile, on nearby Izu Ooshima, cheerful Akane Isshiki, her reliable younger sister Momo, and her grandfather Kenjirou—a co-inventor of the engine—live in peace. This tranquil existence shatters when the "Alone," mysterious beings intent on destroying the engine, make their appearance. After the military proves ineffective against the threat, Kenjirou gives Akane a special key that activates the "Vivid System," granting her the power to combat the invaders. Teamed up with Aoi Futaba, Wakaba Saegusa, and Himawari Shinomiya, Akane and her friends become humanity's final line of defense against this unforeseen enemy.

Hagiwara Sakura and Miyazawa Elena serve as the lead performers for the popular idol unit Sweet Diva. During a television recording, Elena is injured by an attack from female pro-wrestler Kazama Rio. In response, Sakura assaults Rio with a dropkick. Seeking vengeance for her friend, Sakura decides to compete in female pro-wrestling matches.

Following their defeat at the hands of Suzuridani Academy, the Keishin Academy girls' basketball team—Tomoka Minato, Maho Misawa, Airi Kashii, Hinata Hakamada, and Saki Nagatsuka, together with their coach Subaru Hasegawa—pour even more time and effort into improving their skills in the sport day after day. However, this time, new rivals whose abilities may surpass theirs, as well as friends, appear on their journey toward the top.

The island of Hatsunejima is blessed with perpetual spring, dominated by a massive cherry blossom tree that never fades. Legend holds that this tree can grant any desire. Yet, one day, it suddenly loses its magical properties and becomes an ordinary cherry blossom tree.