Lesson in Murder

Masaya is a university student but he attends a school thats 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 middleschool 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