Jokyōshi no himitsu: Shibatte ageru...

Original title: 女教師の秘密 縛ってあげる…

Reiko, a neat and intelligent married woman, runs an English conversation school for middle-aged and elderly people. One day, one of the students, Shindo, spots Reiko in town and gives her a ride home, but discovers a large amount of rope in the luggage she left behind...