Yosuke Hanamura, a clumsy and somewhat irritable transfer-student in Yasogami High start an investigation about a serial murder case in Inaba with Yu Narukami, another transfer-student because one of the victim is the person that make him happy for the first time he was there, Saki Konishi. During those time they investigate the case, they have a lot of kind of memories and make so many new friends, especially Chie Satonaka, a s