Shinobu Himeno is arrested and thrown into Asahi Female Prison for being an unwilling accomplice in a jewelry store robbery. She’s to serve her sentence in the infamous Cell Block 21, a dismal area full of tough, sex-starved women. Himeno is bullied and abused by inmates and guards. After being framed for starting a fight, she is taken away and tied up. Can the shy Himeno ever escape this living hell?
| Actor | Role |
|---|---|
 Shinobu WakanaShinobu Himeno | Shinobu Himeno |
 Tomomi SegawaMiki Tanabe | Miki Tanabe |
 Saeko KizukiYuka Sasano | Yuka Sasano |
 Mako TakigawaCindy | Cindy |
 Shirō ShimomotoSyôichi Kiya | Syôichi Kiya |
| SSusumu MoriokaYukio Sakai | Yukio Sakai |
| YYūko ChibaReiko Satô | Reiko Satô |
| KKeiko HiradeShizuko Komaki | Shizuko Komaki |
 Minako OgawaYoshiko Minami | Yoshiko Minami |
| RRena HattaKyôko Yoshioka | Kyôko Yoshioka |
| MMaria HimenoThe Lesbian girl | The Lesbian girl |
| RRyu IkedaSyôji Yoshioka | Syôji Yoshioka |
| IIchirô TakaokaKôichi Tanabe | Kôichi Tanabe |
| RRyohei TakaokaPrison Officer | Prison Officer |
 Hideaki TezukaHisaya Shibusawa | Hisaya Shibusawa |
| YYûki YazawaFemale prisoner A | Female prisoner A |