During school days, nao. and Hibiki were Yankee rivals. His subordinate, Rin, has remained in a master-servant relationship until today, working as a nurse under nao., who has become a doctor. Nao. enjoys having sex with Rin's lover, a school girl Chloe, in the hospital room, ordering Rin to strip naked in the doctor's office, and having her masturbate. At that time, Hibiki was Chloe's private tutor, but without knowing that Chloe had a girlfriend, she fell in love with him.
