A naive and mischievous schoolgirl, 'Nia-chan', dreams of marrying her homeroom teacher. She sneaks into his room, acting like his wife, and teases him half-naked with a perfect blend of subtle exposure, pushing the man's reason past its limits. Amid the forbidden, guilt-ridden atmosphere of a taboo that must not be touched, this film captures everything from sweaty sex in the nurse's office, a morning facial, to intense mating while wearing only an apron. It's a closed-room love story where she traps her teacher in a swamp of devoted love and eroticism.