A 13 – year – old girl, Rachel, who woke up at the bottom of the building ‘s basement. She lost her memory and I could not understand why she was here. Aiming at the ground, appearing in front of her wandering in the building is a murderer Zack with a sickle like a shinigami, covering her face with a bandage. “Please have a wish … please, please kill me” “Help me get out of here together, I will kill you, then I will kill you” The strange bonds of their two willingly I will deepen. Where am I supposed to be? For what purpose were they confined? What is fate to await them? Two death rows to escape from a sealed building began …!