Spread over three time periods (Summer 10 Years Ago/Summer 5 Years Ago/This Summer), Lost Virgin tells the tale of good-time girl Chisato (Sasaki), hungry for new experiences yet ultimately in search of emotional fulfilment.
| Actor | Role |
|---|---|
| NNikki SasakiChisato Okada | Chisato Okada |
 Daishi MatsunagaTakashi Yamamoto | Takashi Yamamoto |
| CChika SaitoMari Taniguchi | Mari Taniguchi |
| MMami SakuraHikari Shimamoto | Hikari Shimamoto |
| SShingo MukaiTetsuo Shingo | Tetsuo Shingo |
 Kikujiro HondaTetsuo's lover | Tetsuo's lover |
| MMasataka MatsubaraMan from telephone dating service | Man from telephone dating service |
| TTetsuaki MatsueBeef bowl shop employee | Beef bowl shop employee |
 Shinji ImaokaKoichi Maeda | Koichi Maeda |
| HHirokazu TabataYuji Nishida | Yuji Nishida |