There was a series of baffling disappearances of the residents from a tenement house in Edo Fukagawa. Although the constable Izutsu Heishiro discovered the full details of the case, he could not handle it on his own. It went completely unsolved and disregarded. About the time that the case was also forgotten by people, Aoi, a woman who was closely connected to that case, is murdered. Furthermore, the criminal is her son, Sakichi. Believing in Sakichi, Izutsu and his nephew, Yuminosuke, start to search for the real culprit in order to clear him of wrongdoing. The wealthy merchant, Minatoya Soemon, is involved behind the scenes again. Will Izutsu be able to identify the criminal β¦?