Detective Nozawa persuades his wife, Akiko, to go to a swinger club. There, he meets Saeki and Etsuko, who live in the same apartment building, but shortly after, Etsuko's murdered body is discovered...
| Actor | Role |
|---|---|
 Shirō ShimomotoDetective Shunsuke Nozawa | Detective Shunsuke Nozawa |
 Yūko ŌsawaAkiko (Nozawa's wife) | Akiko (Nozawa's wife) |
 Yutaka IkejimaKyoji Saeki | Kyoji Saeki |
 Chiemi AkimotoEtsuko Saeki | Etsuko Saeki |
| MMakoto ChiakiRisa Tachibana | Risa Tachibana |