15-years-ago Vivi, the demon, decided to leave the demon realm and come to the human world. There he found an abandoned baby and on a whim decided to keep it. Since then he lives together with Hana... but ha...

It happened in the blink of an eye. Rikka's world turned upside down when her school field trip bus flipped and plummeted into a lake. Everyone inside that bus drowned... except for Rikka, but she wasn't sav...

Having lost their parents at a young age, Chiharu and her brother find strength in each other. The past behind, the two live their lives in peace. However, the appearance of a new transfer student named Hisa...