Natsuza Yuzuki has been playing rugby as a left-winger ever since he was a child. After enrolling in Doushisha University, he quickly becomes a rising star in the Kansai University League. His dreams are shattered, however, when a nasty motorbike accident leaves him with a spinal hernia—making him unable to be able to play rugby ever again. With no role available other than the position of manager, he accepts his new post and hopes his squad can obtain a league title. Yuzuki's team is an unlikely group, including his stoic best friend and full-back Seiichirou Jingyouji; hot-headed first-year Yasunari Tsuru, who harbors a strong dislike for Natsuza, filling his senior's old position as left wing; and Yuu Mashiro, who is struggling to hold his ground as a scrum half. Despite Natsuza putting his all into training his team for a league title, their squad still feels incomplete. A year ago, Ibuki Ueka, the genius fly-half that was once Doushisha's ace, suddenly quit rugby—and now Natsuza is determined to get him back.

The story revolves around Maya, the daughter of the former Headmaster of Waldstein Academy, and a time traveling agent Fumiaki Uchida. In the year 2012, the world had been invaded by aliens and time travelers were sent back to the year 1999 in order to find and destroy the Nostradamus Key, which Nostradamus Prophecy foretold as what would bring about the apocalypse. The series then turns to the year 1999, where Maya returns to the Academy with the intention of destroying the Academy by superseding her late father's position as the principal. Her plan was interrupted when she meets Fumiaki and learns of the forthcoming destruction. Despite being distrusting towards Fumiaki, they form a pact to look for the Nostradamus Key. In order to find the Nostradamus Key, time agents were provided with specially created cell phones. When a user finds an object of interest, by thinking of destroying it and taking a photo, and if the resulting image is that of a peaceful world, then the subject is the Nostradamus Key. Conversely, if the subject is not the Nostradamus Key, then the photo displays destruction. By using the phone, Maya and Fumiaki investigates occult occurrences as they occur in the town. (Source: Wikipedia)

Genius inventor Null tragically loses her older sister Peta in an accident. To get over the grief, Null develops Peta Robo, a robot with the same characteristics as her late sister. However, the robot is a little different as to what Null expected. (Source: MAL News)

Rikuo Nura, a part-youkai and part-human boy, grew up as the young master of the Nura Clan. While he treated the clan, which consists of youkai of all shapes and sizes, like family, he soon learned that he was the only one among his classmates who saw youkai in this light. To most, they were terrifying creatures of folklore who ate children and relished in bloodshed. Taking this to heart, he swore to live his life as a normal human. Normalcy, however, is hard to come by for young Rikuo. Complicating his goal are his youkai attendant, who under the name Tsurara Oikawa, goes to school alongside him; the young onmyouji Yura Keikain; and his close friend Kiyotsugu, who idolizes youkai and hopes to prove their existence. To make matters worse, rival youkai and other entities threaten to harm those Rikuo holds dear. If he wants to protect what's important to him, Rikuo must acknowledge his ancestry—that he is the grandson of the legendary Nurarihyon—and transform at night into a youkai, becoming worthy of being the next leader of the Nura Clan.