Mari is a female university student. She takes part in an experiment held by popular VTuber Sophia. When Mari arrives at the place where the experiment is to be held, she notices the place looks like a prison. 12 people participate in the experiment and they are assigned roles of prisoners and prison officers. The experiment takes place over 7 days. Mari is assigned the role of a prison officer. The experiment turns violent.
| Actor | Role |
|---|---|
 Mayu HottaMari | Mari |
 Ken NakajimaGure | Gure |
 Kenshiro IwaiGete | Gete |
| YYûka YanoGumi | Gumi |
 Tateto SerizawaYamane | Yamane |
 Shohei UnoH | H |
 Mamiko ItoKamiyama | Kamiyama |
 Haruka TateishiGetsuyo | Getsuyo |
 Nao OkabeRenzu | Renzu |
 Kanako MiyashitaJen | Jen |
 Chihiro OkamotoM16 | M16 |
| MMoeko KonnoMeso | Meso |
 Tomoya MaenoKoki | Koki |
 Tomomi ItanoYuma | Yuma |