The story begins with Satoru Mikami, a 37-year-old who lives a life of disappointment and unhappiness. At a robbery, he lost his life. Unearthly life is boring that ended … But no! It is the beginning of a new life. Mikami wakes up, finds himself in a strange world. And the monstrous thing is that he no longer has a human form that has become a slim-looking monster and has no eyes. As he became accustomed to this new form, he began to explore the world with other monsters and the new world began.