At this mansion, sex party is held every night to fulfill the desires of the privileged class... To investigate the truth behind the black rumors, performing an undercover action in a mansion on an island. Not so far in the future mechanization technology and androids became popular. An advanced level of information and communication technologies were established, in order to free mankind from the imperfections of living things, it had become more common to have a mechanization of the body. Heroine "Rin" used to be mortally wounded, however she survives by the help of mechanization but her sister was missing. Being trained as an agent, she was looking for a chance for revenge. In order to investigate the black rumors behind the resort land. Rin is going to perform an undercover investigation in the resort land. Being fatally reunited with both her sister Mirai and her target... Rin is slowly going to lose to pleasure.