Kogoro and his group visit Tsukikage Island after receiving a letter from a person named Keiji Aso. However, it is said that the client was a pianist who died 12 years ago. When the party was waiting for the village chief at the town hall to find out about the client, the moonlight rang and a candidate for the mayor election was found dead. And the next day, while the police are conducting an investigation, the “moonlight” that hints at death resounds...