Masaya is a university student, but he attends a school that's not his ideal school. His days are generally gloomy. One day, he receives a letter from serial killer Haimura. He was convicted for nine murders and received the death penalty. Back when Haimura was committing his murders, he ran a bakery store. At that time, Masaya was a middle-school student and a customer at his bakery store. According to the letter, Haimura confesses to having committed eight murders, but he insists that he did not commit the last murder. Masaya begins to investigate the last murder case involving Haimura.
Unfortunately the movie Lesson in Murder is not yet available on HBO Max.
| Camera | Naoya Ikeda | Director of Photography |
| Production | Takuro Nagai | Producer |
| Production | Kazumi Fukase | Producer |
| Production | Shintaro Hori | Producer |
| Sound | Takashi Ohmama | Original Music Composer |
| Writing | Riu Kushiki | Novel |
| Art | Tsutomu Imamura | Art Direction |
| Art | Takayuki Nitta | Art Direction |
| Writing | Ryo Takada | Screenplay |
| Directing | Kazuya Shiraishi | Director |
| Production | Takahiro Shinomiya | Production Manager |
| Production | Yoshie Wada | Production Executive |
| Lighting | Hideki Tateno | Gaffer |
| Costume & Make-Up | Ryôko Ariji | Makeup & Hair |
| Editing | Hitomi Kato | Editor |
| Sound | Kenji Shibasaki | Sound Effects |
| Sound | Tomoharu Urata | Sound Recordist |
| Costume & Make-Up | Sayaka Takahashi | Costumer |
| Visual Effects | Rei Asakura | VFX Supervisor |
