Yusuke is having an affair with a female colleague because his sex life with his wife, Jitsuko, has become stale. One day, upon returning home, he finds his wife's younger sister Mai in the bath. After becoming aroused by peeking at her bursting, naked body, Yusuke finds himself being aggressively pursued by Jitsuko...
| Actor | Role |
|---|---|
 Syoko MikamiMai Hisanaga | Mai Hisanaga |
| MMotoko SasakiSaneko Koyama | Saneko Koyama |
| YYuka KatoYumi Saeki | Yumi Saeki |
| AAko IshidaAya Katô | Aya Katô |
 Taishi TakemotoYûsuke Koyama | Yûsuke Koyama |
 Seiji NakamitsuKazuo Endô | Kazuo Endô |