One day, a talkative college student with a natural perm, Totonou Kunou (Masaki Suda) visits Hiroshima for an art exhibition, and there meets a teenage girl, Shioji Kariatsumari, who says she is a friend of Garo Inudo (Eita Nagayama). “Would you work for me? Lives and money are at stake. I’m serious.” She offers Totonou a part-time job, which turns out to be related to the succession of an enormous inheritance. Totonou decides to help her out, only to get involved in an inheritance battle of the noble and shady Kariatsumari family, where people have been killed for generations. Multiple dark sides and mysteries of the family are laid out behind the inheritance. What truth is buried there?
Unfortunately the movie Don't Call It Mystery: The Movie is not yet available on HBO Max.
| Directing | Hiroaki Matsuyama | Director |
| Writing | Tomoko Aizawa | Screenplay |
| Writing | Yumi Tamura | Author |
| Production | Megumi Osawa | Co-Producer |
| Production | Osamu Nozaki | Producer |
| Production | Kusagaya Daisuke | Producer |
| Sound | Ken Arai | Original Music Composer |
