As Rui dies, he is finally able to remember his human life. He was born with a frail body, rendering him bedridden - until Kibutsuji turned him into a demon, giving him a strong body. His father then tried to kill him while his mother did nothing, so Rui slew them both, angry as parents were supposed to protect their children. His mother's last words were that she was sorry she couldn't give Rui a strong body, and his father had intended to commit suicide after killing him...