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 |
| Writing | Riu Kushiki | Novel |
| Art | Tsutomu Imamura | Art Direction |
| Sound | Takashi Ohmama | Original Music Composer |
| Art | Takayuki Nitta | Art Direction |
| Directing | Kazuya Shiraishi | Director |
| Writing | Ryo Takada | Screenplay |
