Kanda-gawa inran senso (1983)
Directors

Kandagawa Wars神田川淫乱戦争
Overview
Two sexually energized young women who live in a high-rise apartment building happen one day to spy from their window a mother and son making love in the apartment across from theirs. They decide to stage a rescue attempt to free him and in the process one of the young women ends up falling in love with the son despite having a boyfriend and enjoying sex with her female companion. Of course, the mother they are warring against has her own plans when she feels her privacy invaded.
Cast

Usagi Asô
Makoto Yoshino
Houen Kishino
Miiko Sawaki
Tatsuya Mori

Masayuki Suo
Crew

Kiyoshi Kurosawa

Masayuki Suo

Akihiko Shiota
Jun'ichi Kikuchi
Shûji Asano

Kunitoshi Manda

Hiroshi Katsuno
Toshiyuki Mizutani
Toshihiko Uryu
Koichi Kasahara
Two sexually energized young women who live in a high-rise apartment building happen one day to spy from their window a mother and son making love in the apartment across from theirs. They decide to stage a rescue attempt to free him and in the process one of the young women ends up falling in love with the son despite having a boyfriend and enjoying sex with her female companion. Of course, the mother they are warring against has her own plans when she feels her privacy invaded.