The dark fantasy follows a high school sophomore named Akihito Kanbara. Although the boy appears human, he is half youmu and invulnerable to wounds because he can heal quickly. One day, Akihito meets freshman Mirai Kuriyama when it seems she is about to jump from the school rooftop. Mirai is isolated because of her ability to manipulate blood, which is unique even among members of the spirit world. Disturbing events begin to unfold after Akihito saves Mirai.
I have read and heard that some people don't like this anime but I'm disagree about that. This is not the best, but I like this and most of this anime's characters too. I would like to write about the end and some other things too, but I'm not going to do that because it would include some spoilers I think ^^''.