Academy City is a highly developed place in terms of technology. It is said to be 20 to 30 years ahead of the rest of the world. Eighty percent of its 2.3 million residents are students. The focus of studies here is directed towards esper powers. Misaka Mikoto, one of the top level espers in town, shares a room with Kuroko Shirai, another high level esper who is a member of Judgement, a law enforcing agency composed of students. Both attend to Tokiwadai, a private school reserved for the high-leveled and the rich. Kuroko's partner at Judgement, Kazari Uiharu, is a low level esper who studies at Sakugawa middle school. Her best friend and classmate there is Ruiko Saten, a level zero (no esper powers). Together, the four encounter several adventures in the exciting scientific town.
Mikoto Misaka, one of the strongest Level 5 espers in Academy City, gave her DNA map to a certain doctor when she was young, believing that it may be used for greater good. Unfortunately for her, it ended up being used to create countless clones of herself; forming the Misaka network, in order to create the strongest esper by sacrificing these clones whom she considers as her own sisters.
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.
AD. 2023, Tokyo. Because of the change of the society such as internationalization and enlargement of the trading, the dark side of the society also continues changing. The criminals are getting deep, and their organizations are increasing its size, then the peace and security is getting worse. The government takes it seriously, and decides to introduce an innovative system. In order to cope with the special criminals, an extralegal police is founded. It is a special criminal team, Warriors, which consists of a few elite members.
Nayu shocks her schoolmates on the first day of middle school by wearing black lace panties. She aims to ''spread the word on the merits of underwear'', and help other girls concerned with their development - by opening a underwear club.
"Mumbling" Chuta Kokonose doesn't have many friends. In fact, the only conversations he has anymore are with voices inside his head. Little does he know that this voice doesn't mean he's crazy. It just means he has an alien living inside his body.
Since so few women are naturally born with the ability to become Pandoras and fight the extra dimensional aliens known as Nova, a program is approved by the Chevalier organization to allow any female to artificially become such a warrior. In order to test this new generation of E-Pandora, small groups of the highest ranked cadets from various Pandora academies around the globe are sent to Alaska in order to gauge the project's progress. Among those sent are Satellizer, Rana, and Kazuya since they display a skill level far above their position. It is not merely their combat prowess that is tested however, when the Evolution Pandora project does not go as expected.
Yoshitaka Nakabayashi, a 14-year-old millionaire who got this huge inheritance after his parents died in an accident, found himself needed to be taken care of and tried to hire live-in maids to do the job. Two runaway girls, Izumi Sawatari and her younger sister Mitsuki, stumped into Nakabayashi's mansion and got hired by Yoshitaka immediately, for Yoshitaka is not only a rich boy but also a pervert with uniform fetishes, who wants to be addressed as goshujin-sama (master). Having nowhere else to settle down along with Mitsuki's pet alligator Pochi, Izumi accepted the job reluctantly.
Dreaming of becoming a hero and vanquishing the Demon King, Raul Chaser enters the Hero Training Program in pursuit of his ambition. However, when the Demon King is defeated and peace returns to the world, the Hero Training Program is suspended indefinitely, making it impossible for anyone to become a hero.
Two years later, Raul reluctantly works at a small electronics store called Magic Shop Leon. Though the former hero-in-training is plagued by the mundanity of working in retail, everything changes with the arrival of a new hire. Appearing at first to be just a boy with good looks, "he" turns out to be a female demon by the name of Fino Bloodstone. She is not just any old demon either—Raul's new coworker is in fact the daughter of the late Demon King! Handed the responsibility of training this eccentric new employee, Raul soon finds his life becoming livelier than it ever was before.
High School freshman Kōtarō Satomi wants to start a new life living alone in the tiny Room 106. That lonesome life is immediately broken by the invasion of a group of mysterious girls who all claim Room 106 belongs to them one way or another.
Guri is an angel with a mysterious item that turns any two people who kiss into a couple. She appears before a high school boy named Seiji Aino. However, there is a yandere high school girl named Akane who loves Seiji.
Masamune Makabe was mercilessly teased for being overweight as child, especially by a girl named Aki Adagaki. Masamune decides to get his sweet revenge by transforming himself into an attractive, intelligent, and athletic young man. After many years honing his new persona, he transfers to Aki's school in hopes of finally getting his long-awaited vengeance.
Kinjirō Sakamachi has gynophobia (fear of women), due to his violent mother and sister. Subaru Konoe is the butler of his classmate, Kanade Suzutsuki, and has to dress as a male due to butlers having to be men. When Kinjirō discovers Subaru's secret, Kanade promises to cure Kinjirō of his phobia. Kinjirō and Subaru are forced due to circumstances to spend time together and defend Subaru's secret while trying to cure Kinjirō's fear.
Medaka Kurokami, a first year student at Hakoniwa Academy, excels at everything she does. She becomes the Student council president and along with her childhood friend, Zenkichi Hitoyoshi, she plans to solve all of the student body's problems that are submitted to a suggestion box, dubbed the "Medaka Box."
After Medaka Kurokami defeated Myouri Unzen (the head of the disciplinary committee), she is recruited by the headmaster to join the "13 Party" - an elite and select group of 13 Abnormal students from Class 13. Medaka discovers that they are taking part in the Flask Plan, which aims to create perfect humans by sacrificing all the students in the school. It is up to Medaka and the rest of the student council to stop it.
A girl named Mitsuki Kanzaki lives with her step-brother Yuya after her mother remarries. One day, Mitsuki is possessed by the self-proclaimed spirit of a young girl, Hiyori Kotobuki. Hiyori (in Mitsuki's body) must fall in love with Yuya to move toward the "Gates of Heaven."
Asuka and her 4 friends attend the secret Hanzo Academy, which trains young women in the martial art of Ninjutsu. However, the girls find their own skills are inadequate when faced with another group of girls from their rival, Hibi Girls Academy, which trains its Ninjas with the opposite moral philosophy.
In the short weeks leading up to Koyomi Araragi's graduation from high school, he experiences a troubling incident that leads him to question his humanity. While searching for answers he enlists the assistance of the human-like doll Yotsugi Ononoki in order to find out where the truth lies in the present and for the future.
In 2018, humans and wizards live together in Tokyo. Police continue to protect order in society, but wizards are tried according to magical law, in special courts defended by wizard barristers. At age seventeen, Cecile has just become the youngest wizard barrister, and begins work at the Butterfly Law Offices. While she hasn't realized it yet, she has tremendous magical potential.
Ryuu Yamada is known as a delinquent in his high school; he has been bored of classes after one year of attending school. One day, he accidentally falls from a flight of stairs onto Urara Shiraishi, the ace student of the school. Yamada wakes up to find that he has swapped bodies with her! The two try to reverse the change and discover that kissing triggers the body swap. On the suggestion of student council vice-president Toranosuke Miyamura, they revive the Supernatural Studies Club. The club encounters other "witches" with different powers that are activated with a kiss!