Female Teacher in Rope Hell (1981)

Plot

A dedicated female teacher witnesses a disturbing incident when she sees a vagrant assaulting one of her students. Her attempt to intervene backfires, leading to her own assault in an isolated classroom. The traumatized student seeks help from a piano tuner, who can only provide emotional support. As events unfold, the piano tuner invites the teacher to his home, revealing his unsettling intentions. He has constructed a caged apartment in his basement, subjecting her to a relentless cycle of sexual degradation in a twisted effort to win her submission and affection.