Kanji Tatsumi is a first-year troublemaker in Yasogami High who is said to have destroyed a biker gang single-handedly while in middle school join The Investigation Team about a serial murder case in Inaba since he was kidnapped and then saved by the team in May 2011. During the time he spent with the team, he met many friends including Naoto Shirogane, a high school detective who he

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