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.
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.
Tomoya Okazaki is a third year high school student resentful of his life. His mother passed away from a car accident when he was younger, causing his father to resort to alcohol and gambling. This results in fights between the two until Tomoya's shoulder is injured in a fight. Since then, Tomoya has had distant relationships with his father, causing him to become a delinquent over time. While on a walk to school, he meets a strange girl named Nagisa Furukawa who is a year older, but is repeating due to illness. Due to this, she is often alone as most of her friends have moved on. The two begin hanging out and slowly, as time goes by, Tomoya finds his life shifting in a new direction.
The Empire of Britannia has invaded Japan using giant robot weapons called Knightmare Frames. Japan is now referred to as Area 11, and its people the 11's. A Britannian who was living in Japan at the time, Lelouch, vowed to his Japanese friend Suzaku that he'd destroy Britannia. Years later, Lelouch is in high school, but regularly skips out of school to go play chess and gamble on himself. One day, he stumbles on terrorists 11's who've stolen a military secret and is caught by a member of the Britannian task force sent after them, who is Suzaku. As the rest of the squad arrives, Suzaku is shot for disobeying orders, while the military secret, a young girl, gives Lelouch the power of Geass, which makes anyone obey any order. While Suzaku is secretly made the pilot of Britannia's brand new prototype Knightmare, Lancelot, Lelouch becomes the masked Zero to lead the rebellion to destroy Britannia once and for all.
Kazama Kenji was feared as the worst delinquent of Fujou High, but after certain events led him to peek in on the Game Development Club, he witnesses the outbreak of a fire. While the members inside manage to succeed in putting it out, they all attack Kenji to erase his memory and hide the incident. Kenji desperately tries to escape from them, but when their president Shibasaki Roka rescues him he ends up joining their Game Development Club.
A short flashback of what happened in prequel of Heaven's Lost Property series until there's an Angel, Hiyori Kazane who is dreaming while her real body is in heaven. She had a crush on the main protagonist, Tomoki Sakurai who fight until the end where the world has memory about Hiyori erased when she died in her dream and returned to her real body. She wanted to return to her dream so much that she got modified into an Angeloid of Clockwork by heaven's master but got back consciousness with help of Tomoki. However, it was not enough to save her life.
It's the final year of high school for Yui Hirasawa (guitar), Ritsu Tainaka (drums), Mio Akiyama (bass), and Tsumugi Kotobuki (keyboard). The founding members of the Light Music Club. Together with their junior member Azusa Nakano (guitar), they spend their days after school in the music room enjoying tea and sweets, and practicing music. Amidst band practice, preparations for the new student orientation performance, scouting for new members, and student responsibilities they still have time for "After School Tea Time".
Senō Natsuru is your normal, everyday high school student. However, he's been chosen to be a Kämpfer, who's objective consists on fighting other Kämpfer with either guns, swords or magic. However, there's catch—first, you can't chose if you're a Kämpfer or not, and second, you must have the body of a girl to use your powers.
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.
Kazuya Maeda is a high school student who has received a digital camera from his father. Motivated by this new hobby, he enters the school´s photography club. This gives him the opportunity to see several new perspectives towards the girls near him.
Despite Ryuji Takasu's gentle personality, his eyes make him look like an intimidating delinquent. Class rearrangements on his second high school year put him together with his best friend, Yusaku Kitamura, and his hidden crush, Minori Kushieda. Along with these two comes Kushieda's best friend, Taiga Aisaka. Her delicate appearance contrasts with her brutal personality. Secretly in love with Kitamura, Taiga agrees to help Ryuji with his love interest as long as he helps her get closer to hers.
Tomoko Kuroki is about as socially dysfunctional as it is possible for a first year high school girl to be. We start the story when she realizes she has attended high school for three months without even talking to anyone at all. Not all is lost, however, since she is irrepressibly optimistic about her chances to turn it around and live a fulfilling high school life.