Kamijou Touma is a student living in Academy City, a highly advanced place in terms of technology. Despite being gauged as a level zero esper (no powers), he possesses on his right hand the Imagine Breaker, an ability that negates any power whatsoever. Touma finds a young girl named Index who is trying to run away from Necessarius, a powerful magic organization that she is member of. Blessed with the skill of memorizing any sort of information, she holds 103,000 forbidden magical books within her head. As science and magic cross paths, Touma must face several dangers amid espers and magicians who appear at the exciting scientific town.
Tokyo Butei High School is a special school where armed detectives—"Butei"—are trained to use weapons. Kinji Tōyama is a second year student who has a special ability, but he keeps it a secret to maintain an ordinary, peaceful life. However, when he gets caught in a bombing on the way to school, he encounters Aria H. Kanzaki, the most powerful S-Rank Butei student in Assault Studies.
Advanced placement into a school of higher grade proof-reading is determined by the results of the Promotion Test strictly for class type. Ranging from A class with the best facilities anyone can offer all the way down to F Class which is composed of low dining tables, rotten tatami mats and other worn out facilities. Students can change classes by competing using the Examination Summons Battle system or ESB. Students summon characters with their equivalent test mark scores and use them to compete with other classes.
Godō Kusanagi is a 16-year-old high school boy, who once killed the god "Verethragna" and acquired the title of "Campione" ("God Killer") when he was 15. Erica Brandelli is a 16-year-old Italian girl, who is a "Great Knight" of the magic society "Bronze Black Cross" and had fought together with Godo to defeat Verethragna. Godo doesn't like fighting but his title of "Campione" makes him get involved in battles against other Campiones and uncontrollable gods.
Sakura Kinomoto was an ordinary 4th grader until the day she opened a strange book and let dozens of powerful magic cards loose on the world. Keroberos, the Guardian of the Clow Cards, informs Sakura that it is now her responsibility to find and capture the freed cards. However, much to the reluctant Sakura's dismay, things aren't going to be easy for her. Simply saying magic words and waving her wand around isn't good enough. Each card is a living, thinking, extremely powerful being. She'll have to learn to cope with her new responsibilities, as well as ordinary troubles involving love, school, family, and friends. With the support of her friend Tomoyo and a young boy with powers of his own, she must learn how to use her newly awakened magical abilities to collect each card and prevent the disaster that will befall the world if she doesn't.
In the future, personal computers have developed into "Persocoms", mobile computers that look like human beings. Hideki Motosuwa, a prep school student, desperately wants to buy a Persocom but cannot afford to. One day he finds a Persocom that has been thrown away and decides to keep it. When he turns on the Persocom, all she can say is "Chii" so he decides to name her that. After a while it starts to become apparent that Chii is more than an average Persocom. Having much better performance, it seems that Chii might be a "Chobit", a type of advanced Persocom rumored to have independent thought.
Thirty years ago a strange phenomenon called a "spacequake" devastated the center of Eurasia, claiming the lives of at least 150 million people. Since then, smaller spacequakes plague the world on an irregular basis. Shido Itsuka, a seemingly ordinary high schooler comes across a mysterious girl at the ground zero of a spacequake and learns from his sister Kotori she is one of the "Spirits" who are the real cause of the spacequakes that occur when they manifest themselves in the world. He also learns that Kotori is the commander of the airship Fraxinus, crewed by the organization Ratatoskr, and is recruited to make use of his mysterious ability to seal the Spirits' powers thus stopping them from being a threat to mankind. However, there is a catch: to seal a Spirit's power, he must make her fall in love with him and kiss him.
Ryūji Kisaragi is a normal high school boy whose peaceful life is turned into an adventure by the return of his second cousin Eriko Nanao. Ryūji and Eriko seize a relic box from a black broker, and in the box they find Rose, a red dragon girl. In order to protect Rose from the black organization, Ryuji decides to fight using his power as a relic handler.
Three years ago, the world learned that harpies, centaurs, catgirls, and all manners of fabulous creatures are not merely fiction; they are flesh and blood - not to mention scale, feather, horn, and fang. Thanks to the "Cultural Exchange Between Species Act," these once-mythical creatures have assimilated into society, or at least, they're trying. When a hapless human teenager named Kurusu Kimihito is inducted as a "volunteer" into the government exchange program, his world is turned upside down. A snake-like lamia named Miia comes to live with him, and it is Kurusu's job to take care of her and make sure she integrates into his everyday life.
Five years ago, while battling an alien force known as the "Mimesis," Dannar pilot Goh Saruwatari first met Anna Aoi. Today, on the day of their wedding, the ceremony is interrupted when the Mimesis strike again. As Goh struggles in his battle against the alien threat, Anna stumbles upon a top secret robot known as the "Neo-Okusaer" and uses it as a last-resort to save her fiancee. At that moment, Dannar and Neo-Okusaer merge to become the mighty robot "Godannar."
Set in the year 2039, Japan is the under the rule of a multinational military force called GHQ after the country went into chaos due to the "Lost Christmas" incident ten years prior to the start of the series, when a giant outbreak of an alien virus called the Apocalypse Virus spreads during Christmas, causing the United Nations to send the GHQ to contain the outbreak and restore order. The series follows Shu Ouma, an intelligent yet socially awkward teenager who finds himself caught in the war between the GHQ and "Funeral Parlor (Undertakers)", a resistance organization led by Gai Tsutsugami, which aims to liberate Japan from the GHQ, when he meets Inori Yuzuriha, the famous Internet Singer of the band Egoist and a member of the Undertakers. Due to various circumstances, Shu acquires a genetic weapon called the Void Genome, also known as "power of kings", which allows him to extract "Voids", objects with special properties that reflect the personality of their owners from underage individuals. With his new powers, Shu joins the Undertakers to protect Inori and learns secrets and mysteries he never knew.
Ayumu Aikawa must continue to fight the Megalo in place of Haruna, who continues to recharge her magical powers. While trying to figure out the mysteries behind the people who are releasing these Megalo in the world, Ayumu meets a beautiful, black-haired girl by chance, and she only has eyes... For his butt.
Kanokon's story revolves around Kouta Oyamada, a young first-year high school student who moves from the country to the city and thus transfers to Kunpo High School. On his first day at his new school, a beautiful second-year female student named Chizuru Minamoto asks him to meet her alone in the music room. When he arrives, she reveals that she is in fact a fox deity and from that day on the two hang out together. Nozomu is a first-year female student at Kouta's school, she is in fact a wolf deity and in love with Kouta, and a rival of Chizuru for Kouta's affections.
A chibi robot doll appears in the room of a typical high school boy. The robot claims the boy as her husband and then a beautiful girl comes out of the doll's mouth who knows the boy from 10 years prior and had been promised his hand in marriage.
Misaki Ayuzawa is the first female student council president at a once all-boys school turned co-ed. She rules the school with strict discipline demeanor. But she has a secret—she works at a maid cafe due to her families circumstances. One day the popular A-student and notorious heart breaker Takumi Usui finds out her secret and makes a deal with her to keep it hush from the school in exchange for spending some time with him.
Takeru Ohyama, a young normal yet perverted minded guy, got accepted and now goes to a school that, unknown to him, was where combat and magic is used. On the first day, he meets again after three years: Haruko Amaya, his childhood friend, Inaho Kushiya, a girl who says she's his fiance, and Kodama Himegami, a blonde who wants to kill him. Finding out that there are many girls there that just don't like him, he is told that everyone there uses a special magic ability while using an item or weapon called a Maken. Later, he finds that no Maken is acceptable for him and doesn't know what to do, since in this school the students get into duels that showcase their magic and combat power, of which he seemingly has none.
The story begins with Izumi Hayato running to be student council president. But when a beautiful girl swings in promising the liberalization of love while flinging condoms into the audience, he ends up losing to her and becoming the vice president. At the student council meeting, the newly-elected president invites herself over to Izumi's house, where she promptly announces she is to become Izumi's wife thanks to an agreement—facilitated by alcohol—made between their parents when they were only 3.
As a child, Raku Ichijo made a secret promise with his childhood sweetheart, keeping a pendant as a memento while his love took the key. He dreams of one day meeting his past love, but years later, reality smashes his hopes when Chitoge Kirisaki accidentally knees him in the face. Though Raku's a normal high schooler, his family heads the notorious yakuza gang the Shuei-Gumi faction. And he's dragged into family affairs when he's forced into a relationship with Chitoge, the daughter of a rival gang's boss.
Haruhi is a poor tomboyish student at a school for the ultra-wealthy, able to attend because of a scholarship, and unable to even afford a uniform. One day, she stumbles across the decidedly peculiar but very popular Ouran Host Club. She tries to leave, but accidentally breaks a vase, and unable to pay for it, she's told that she'll have to stay and do odd jobs. That is, until they decide she would be more valuable as a club member. Not realizing she's female due to her appearance, they fix her up and give her a male uniform. She's an instant hit, so they decide to have her keep up the charade even after they find out the truth. Haruhi, being average almost to a fault, doesn't know what to make of the unconventional activities of the Host Club (or of the even more unconventional members), but having little choice, she plays along. Before long, real bonds are formed, friends made, and Haruhi finds herself accepted in a way she could never have been otherwise in this affluent school.
Due to poor grades, Tsukune Aono, an average high school student, has been unable to get accepted into any private academy of his choice. By exceptional accident, the only school to accept him turns out to be anything but ordinary; the school is attended by youkai disguised as humans. Fearing for his life, he attempts to escape only to meet Moka Akashiya, a beautiful girl who just happens to be a vampire. Despite this, Tsukune decides to stay at the academy, hiding his human nature from students and teachers. Tsukune also discovers that when the rosary around Moka's neck is removed, her true nature emerges.
Minato Sahashi is extremely intelligent, yet due to his inability to cope under pressure has failed the college entrance exam twice. As a result he has been branded an idiot and loser by many. One day after talking to his yet again disappointed mother he comes into contact with a girl named Musubi who was under attack. The girl runs but takes him with her and soon finds that Minato, while unknown to him, is an Ashikabi, one of the mysterious set of masters that have the genetic trait that can become partners with some of the 108 cute girls, buxom women, and bishōnen called "Sekirei". The reason for the partnership allows the Sekirei to use all their power to win in the competition held by the mysterious MBI corporation.
Souchirou Nagi and Bob Makihara are two delinquents who arrive at Toudou Academy with the objective of ruling over the school with their strength. But on their first day, they encountered the Jyuukenbu, a martial arts group of the school. Members of the group, Maya Natsume, her sister Aya, and Masataka Takayanagi easily overpowered Souchirou and Bob. And what's more, due to what was assumed to be their "connections" with the Jyuukenbu, the two were attacked by members of the Enforcement Group, which oversees the martial arts groups of the school. Drawn into the personal conflicts between the Jyuukenbu and the Enforcement Group, Souchirou and Bob have no choice but to join up with Maya Natsume's group and to hone their skills to become even stronger.
Yōto Yokodera is a perverted schoolboy who is unable to express his true feelings freely. After hearing about the wish-granting Stony Cat, he decides to try and make an offering to lose his facade, only to meet Tsukiko who wishes instead to be more discreet with her feelings to become more adultlike. Who'd have thought the rumors of the wish-granting Stony Cat turns out to be true; transferring the facade that Yōto wishes to lose into a classmate who needs it more and making it difficult for Tsukiko to show even the slightest of emotions on her face. Being on the same boat, they both search for ways to remedy the situation.
Rokuro is from a family of exorcists who remove the evil Kegare, but his real dream is to be a singer, a soccer player, or anything other than an exorcist. When another exorcist name Benio arrives, Rokura is suddenly inflamed with competitive spirit and decides to put his natural knack to good use. Their rivalry gets more complicated when they both learn they are the destined "Twin Star Exorcists," two ultimate fighters fated to marry and create the prophesied child who will eliminate all the Kegare in the world.
Urusei Yatsura is the story of the unluckiest and most lecherous young man alive, Ataru Moroboshi. When aliens decide to invade Earth, Ataru is randomly selected to defend his planet by playing a game of the aliens national sport, tag. Should he win, the world shall be saved. However, Ataru is motivated for far less noble reasons, as the one he plays against is revealed to be the curvaceous alien princess, Lum. The game goes for 10 days, and on the last day, Ataru, motivated by his girlfriend assuring him marriage (and consequently, a marriage night one can assume) should he win, finally catches Lum. However, with his victory he gives a cry of joy for his coming marriage, which is misinterpreted by Lum to be a marriage proposal. She promptly agrees, beginning the two's "marriage" together.