The main character lives at an old apartment. He, one and only resident of the apartment, secretly loves a caretaker, Azusa. However, his love towards her gradually becomes an obsession.... "I'm now thinking about leaving this apartment...." Azusa knows if he leaves, she will need to close down her apartment. "Please don't leave! I'll do whatever you want.... Please...." She really wants to keep her apartment. Like this, their abnormal sex life starts....
