One morning, the high school student Takashi Komuro enjoys the silence at school when he's suddenly interrupted by strange noises and a shaky-legged person who tries to enter the school grounds. Subsequently, several teachers come to the school gate to shoo the person away. All of a sudden, a teacher is bitten by the person and within seconds the school campus becomes a place of violence, blood, death and undead zombies. Takashi, shocked by the scenery, runs for his life to save his schoolmates and childhood love, Rei Miyamoto. The struggle for survival has just begun…

In the Kanto region of Japan, seven high schools take place in a turf war for territorial supremacy: Nanyo Academy, Kyosho Academy, Seito Academy, Yoshu Academy, Rakuyo High School, Gogun High School, and Yoshu Private School. The fighters of each school bear the sacred jewels called magatama, which contains the essence of warriors from the Three Kingdoms era of Ancient China 1800 years ago, as well as their fates.

Kiitarou is a boy with a strong sixth sense who is always surrounded by demons. He gets talked to by yukionna, gets his bath licked clean by akaname (licking demons), and lives with the zashiki-warashi Suzu, whom he just can't come to dislike.

Kunyan lives her crazy life of misadventures from episode to episode. This comedy series is accompanied by a narrator who scientifically explains all that happens to her.