In Tokyo, an impenetrable field known as "Hell's Gate" appeared ten years ago. At the same time, psychics who wield paranormal powers at the cost of their conscience also emerged. Hei is one of the most powerful of these psychic agents, and along with his blind associate, Yin, works for one of the many rival agencies vying to unlock the mysteries of Hell's Gate.
After death, humans go to either heaven or hell. But for some, at the instant of their death, they arrive at the Quindecim, a bar attended by the mysterious white-haired Decim. He challenges them to the Death Game, wherein they wager their lives and reveal their true natures. Decim himself is the ultimate arbitrator of who wins and who loses, who lives and who dies.
After death, humans go to either the eternal void or are reincarnated. However, where there's doubt as to were to place some occasional souls, these instead arrive at bar Quindecim, with no memories of having died. Decim, the bartender, challenges them to the Death Game, wherein they wager their "lives" and reveal their true natures. Decim himself is actually an arbiter in charge of deciding the fate of those that arrive at Quindecim - by pulling the darkness from deepest within them, he judges their ultimate fate.
Ash is a student at Ansalivan Dragon Academy, attended by children who have formed contracts with dragons. He possesses the "star mark," the sign of a contract, but since his partner hasn't been born yet, he seems insignificant. The awakening of the dragon he's raising inside his body is triggered by an incident, and it emerges in the form of a young girl.
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.
The Japanese Ministry of Defense has an anti-paranormal special forces group called the Paranormal Disaster Countermeasure Headquarters. They're the ones responsible to protect Japanese soil and its people from supernatural and paranormal events. However, things didn't go so well in one of their missions, which leads to intervention by the Ministry of Enviroment's Supernatural Disaster Countermeasures Division after the PDCH has sustained large numbers of casualties battling demons.
Noriko Takaya's dream is to become a space pilot like her father, Admiral Yuzo Takaya. He died when she was still a little girl due to an attack of alien forces in deep space. After entering Okinawa Girls Space Pilot High School, Noriko is handpicked by instructor Kouichiro Ohta as someone with great potential. She must then persuade everyone, especially herself, that she can indeed fulfill her goal and become an accomplished pilot despite being just an ordinary girl.
Narumi Fujishima is an ordinary high school boy who remains isolated from his fellow classmates. One afternoon fellow classmate Ayaka Shinozaki invites Narumi to join the gardening club and introduces him to a reclusive detective named Alice. Alice hires Narumi as an assistant and puts him to work solving the strange mysteries of Angel fix, an illegal drug. Little does he know it could put him and Ayaka in serious trouble.
Isei finds new troubles about to enter into his life and two even sleeping in his bed. While looking at an old photo album of Isei's, Kiba sees a familiar sword being held by an old friend of Isei's, which reopen's old wounds. Meanwhile, Devils, Fallen Angels, and The Church's agents all clash to get their hands on, or just destroy, powerful weapons called Holy Swords. If that weren't enough, Isei's red dragon warns him that he senses his old rival the white dragon is drawing near.
The story follows Issei Hyōdō, a dim-witted, lecherous second-year high school student who is killed by a girl on his first date ever. Issei is reincarnated as a devil, and from that day forward, he serves as an underling of Riasu, a high-level devil who is also the prettiest girl on Issei's campus.
Asano begins work as the housekeeper for the old family of Shimazu, where he meets the ill-mannered, selfish, beautiful Sakaya. She is actually the 37th head of the Shimazu family in charge of sealing away monsters with Spirit Archery. Discovering that he has the powers of "true names" and "true eyes,"Asano becomes wrapped up in Sakaya's battle with the monsters as her assistant.
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.
Tokiha Mai and her sickly younger brother, Takumi, have received a scholarship to attend the prestigious Fuuka Academy. On the way, the ferry they are travelling on becomes the site of a destructive battle between two girls wielding apparently supernatural powers. This is only the beginning of their troubles, as Mai learns that she herself possesses these powers - the powers of a HiME.
Eruna Ichinomiya is a third-year junior high school student who has not decided on which high school to attend, and spends her days skipping school and playing games at home. One day, Eruna's eyes are captivated by a photo of Seisa Mikagura in a pamphlet for Mikagura Private Academy, given to her by her cousin, Shigure Ninomiya. Feeling that it is fate, Eruna decides to attend Mikagura Academy. However, Eruna discovers that Mikagura Academy is a school where only cultural clubs exist, and that it has an intense battle system where students with special powers must fight each other as representatives of their own clubs.
Junpei Kōsaka is a second-year high school student who despises cats and has an allergy to them. It just so happens that his high school crush is Kaede Mizuno, a girl who adores cats. One day, while walking home from school, Junpei kicks an empty can and unfortunately beans the local neko-jizō-sama (guardian deity of cats). Soon, he finds he can now understand what cats are saying, including his family's own ill-tempered cat, Nyamusasu. However, if he does not grant 100 wishes from cats, he will turn into a cat himself.
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."
Arata Kaizaki is an unemployed, single 27-year-old who has just been cut off from his parents' financial support. Unable to find a job due to him leaving his previous employer within three months, he is stuck. One night after drinking with a high school friend, Arata meets Ryo Yoake, a man who offers Arata pills to turn him back into a 17-year old so he can redo his life. After agreeing to the experiment, Arata joins a high school class, and meets Chizuru Hishiro, a socially-awkward silent beauty who yearns to have friends. Through connecting with her and other classmates, Arata must find what he lacks to live a happy life in the real world within a one-year time limit.
Jr., the heir of Romana and his battle sabers Cherry and Lime, who have girl circuits are enjoying their peaceful life in Romana. Suddenly, the evil Star-Face and his sexadolls attack Romana in order to take over so Star-Face can become the next High Official. In order to truly become the next High Official and ruler of Romana, he must first eliminate Jr. This begins a battle for, not only Jr.'s life, but for all of Romana.
Chihiro Furuya, who loves zombies above all else, meets the sweet girl Rea Sanka by chance, and he ropes her into "resurrecting" his dead cat. But then Rea claims she actually has become a zombie, and asks him to take responsibility for it.
The year was 1970s. Fascinated by the performance of rakugo master Yakumo the 8th at a philanthropic show in a prison, delinquent Kyoji visited Yakumo immediately after serving his term, begging Yakumo to take him in as an apprentice. To his surprise, master Yakumo agreed without much hesitation, yet things progressed not quite as Kyoji expected.
Sword princess Aiz Wallenstein. Today, once again, the strongest female swordsman heads to the giant labyrinth known as the "Dungeon" along with her allies. On the 50th floor where mysteries and threats such as a decayed dragon's corpse that crumbles to ash and an irregularity that creeps ever closer to the party loom, Aiz calls for the wind and heads deeper into the darkness of the Dungeon. Eventually, she finds herself meeting a boy for the first time. "Um, are you OK?" In the Labyrinth City of Orario, the contrasting stories of the boy and the girl intersect!
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.
Enter Sentan, a lush, tranquil island encased in war between the military and those with Hiruko, known as X'amd. On one of these warlike days, Akiyuki Takehara heads off to school and gets caught in a raid by the creatures. Through a series of events he is transformed into a X'amd, and with the help of a Tessikan woman Nakiami along with his highschool friend Haru, Akiyuki is forced to learn to live with the Hiruko or faces the danger of losing his self-control and turn to stone.