One day, Hikari Seno questions her professor about her classmate who suddenly disappeared 3 weeks ago.
| Actor | Role |
|---|---|
 Tomohisa YamashitaSaku Narumi | Saku Narumi |
 Mizuki YamamotoHikari Seno | Hikari Seno |
 Kei TanakaNot listed | Not listed |
 Yōsuke AsariNot listed | Not listed |
 Takashi NikaidoNot listed | Not listed |
 Natsuna WatanabeNogawa Ryoko | Nogawa Ryoko |