Yusuke Saito is a normal high school kid...well, normal enough, except that he can't remember anything from his life except the last six months. But when he starts to get confronted by people who insist they're from his past, who allege that he did horrible things to them...suddenly Yusuke's missing memories become crucial to remember. Otherwise, the skeletons in his closet may just make him a skeleton, too...
Nobody needs to be unhappy any longer. Striving to live up to his credo, Detective Shibasaki makes contact with Yusuke, a certain theory in his mind. Soon he learns the truth behind the two bodies found by the dam. As the story heads toward ultimate destruction, another life finds itself reaching its wretched, vain end...as another so-called "devil" enters the scene.