Modern-day middle school girl Hideyoshi is mysteriously hurled into a world resembling the warring states period of Japanese history, only this time it's inhabited only by women. This world's Oda Nobunaga is gathering the legendary Crimson Armor so she can rule the world, and for some reason needs Hideyoshi's help to do it.
Humanity has successfully colonized all the planets in the Solar System, with intentions to continue into new frontiers. Individuals live stable lives in these colonies, including young high school students living in 4th Tokyo on Mars. Two of these students are Iris Shirazaki and Mizuki Sera. Iris is finishing her last year of high school while studying to be a test pilot while her friend Mizuki also works as a mechanic on the aircraft. Her own brother, Kaito, oversees Mizuki and Iris as their homeroom teacher and program director.
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.
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.
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.
Zero is a witch who is ignorant of the world and travels with a half-beast half-human mercenary who longs to be human. Witches who practice sorcery exist in the world, however, in this era no one knows how about the art and study of witchcraft. Zero is going on a journey to search for a magical tome called "The Book of Zero" that hides a power that can destroy the world. The mercenary travels with her as her guard.
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.
Five girls live in 19th century London, a city within the Albion Kingdom divided into east and west by a large wall. The girls serve as undercover spies enrolled as students at the prestigious Queen's Mayfair school. The girls make use of their individual abilities to remain active in the underground world of disguise, espionage, infiltration, and car chases.
Tanya Degurechov used to be one of Japan's elite office workers, but because of a wrathful god, was reborn as a little girl. She has blonde hair, blue eyes, and nearly transparent white skin, and she flies through the air and mercilessly strikes down her opponents. She speaks with a young girl's lisp and commands the army. Tanya prioritizes optimization and career advancement above all, and she will become the most dangerous entity among the Imperial Army's sorcerers.
Goryōkan Academy is a new private senior/junior high school for girls with a vast downtown campus. This highly popular school has "another face" — a secret hidden side. It organizes and trains the special unit Fifth Force to protect the world from invisible supernatural entities known as "Oburi" that are devouring the world. A team of five trained with powers against the Oburi is to be chosen from the student body to perform missions. A new team leader has been appointed to assemble the five students.
Rinka Urushiba is a normal high school girl, until she encounters a penguin and shoals of glowing fish swimming through the sky. She looses consciousness only to awaken with the power to move through inanimate objects. At first she thought it was a hallucination if it were not for Kyotaro Azuma who witnessed the event and who, incidentally, has the ability to teleport. They decide to use their powers to combat people who might use their powers for evil.
Kazuya Kagami's most treasured possession in the world is the obi left to him by his late mother. The scent of cherry-blossoms infused into it helps him through his day - but he never expected it to save his life, becoming a beautiful kimono-clad girl who calls herself an "artifact spirit." Her name is Kiriha, tsukumogami of the sash, who naturally moves in with him, as he is her "owner." Throw in Chisato, his bespectacled friend, an overprotective older sister who wants to take baths with him, a busty priestess, a seductive sorceress named Kokuyoura, and Kazuya's life has just gotten a lot more interesting.