Maruhi nikutai chokyôshi

Original title: (秘) 肉体調教師

Directed by Nobuaki Shirai

When a poor student can’t pay his bill at a snack bar a mysterious woman pays it for him. She ends up taking a room at the boarding house where he lives. With her lively personality she becomes erotically involved with all the residents living there and helps with their various sexual problems.