Kurasaki Huoye is a scumbag with very low magic ability. When he got lost together, he met a mysterious girl - Baiyin Yako. She was obviously the same age as him, but she had amazing magic power and mature thoughts. She was an out-and-out top student. As time went by, characters such as Mori Reihime and Baiyin Binzi also appeared in front of Huoye. And it was such an accidental encounter that started a thousand-year hatred between demons and humans...