A young man's roomate has multiples personalities and tries to rape him. He says that once they knew each other, but the young man doesn't remember.
Finally he first met him when they were little. They become lovers.
One of his childhood friends who is psychiatrist tells him that the youg man needs a treatment. One day, thanks to our main caracter, one of the personalities disapears and it becomes urgent to make him cured.
Chapter 10
Adam no Rokkotsu