Three years ago Haruki’s parents were killed in a car accident leaving Haruki with no one but himself. Luckly, Haruki was soon adopted into the Nagisa family, but Haruki has a dark past that none of them knows. As it turns out Haruki’s father was a highly skilled trainer within a prostitution ring called Under Eden. Before he died Haruki’s father introduced the young boy to the local establishment in the city called Paradise. With the intention to follow in his father footsteps, Haruki befriends the master of the establishment and also gets access to various drugs and other equipment to use as he see fit.