Touko's life seemed so ordinary, until she got that call… At the scene of the accident, by the puddle of blood, a young maid appeared… could no one else see her? And then, around the corner, a cry for help from a silver-haired boy… The veils are being lifted and the truth is being revealed! [Wikipedia](https://ja.wikipedia.org/wiki/%E5%A4%A9%E7%8D%84_-HEAVEN%27S_PRISON-)