One day, blond-haired college students Kenichiro and Aina are asked by a mysterious man, Inada, to search for the whereabouts of their missing friend Yukio Sumida. When he heads to the pub, there are people who seem to be related to Yukio: Knight, Tatsuhiko, Emi, Tsubasa, the clerk, and Narushima and five other people were gathered. Kenichiro and his friends are told by Inada that the criminal who killed Kousei is among these seven people. (Not a fictional character)