Miyata, who is careless with women and money, has a girlfriend whom he can use as he pleases, but he finds out that her younger sister is his ideal partner. Scheming to somehow make her his own, Miyata sneaks into Azu's room while she is asleep one night and threatens her with an erotic video he had taken of her sister as a hobby. Azu resists, but is persuaded into giving in. Later... Miyata invites Azu to his house and begins training her with aphrodisiacs to turn her into a sex slave...