Natsumi, a female college student attending a university in Tokyo, lives in a luxury apartment left to her by her parents and leads a carefree life. However, her older sister Keiko moves into Natsumi's room after her brother-in-law dies in an accident. Natsumi, who is quite promiscuous, is no longer able to have the sex she loves because of her sister...
| Actor | Role |
|---|---|
| EEmiko HaraNatsumi Hasegawa | Natsumi Hasegawa |
| TTakanashi TakadaDeceased father | Deceased father |
| MMahiru TsurusuiDeceased mother | Deceased mother |
 Yutaka IkejimaAndo | Ando |
 Yumi YoshiyukiKeiko Momoyama | Keiko Momoyama |
 Kazu ItsukiSatoru | Satoru |
| TToshihiko KurosawaKenji | Kenji |
| KKenichi KôbeTakuro Aoyagi | Takuro Aoyagi |
| MMisao SugiharaMiyuki Saeki | Miyuki Saeki |
| RRuka SawakiMiyuki's friend | Miyuki's friend |
| KKaoru YamashinaSadistic man | Sadistic man |
 Kyoko GodaiYayoi Ozaki | Yayoi Ozaki |