Yoshino Shinya is a high school boy who is bullied all the time at school, which leads him to have no friends. However, no one knows that he is actually half-youkai, and due to that, he has the desire to eat human flesh. But because of the promise he made with his youkai father never to prey on humans, Shinya tries to resist his youkai blood that is thirsty for human's blood, and live as a normal high school student. Will he be able to keep the promise he made with his father and keep his secret hidden?