After three consecutive days of heavy rain, the water level at Sumida River rises and the newly built Eitai Bridge collapses just two years after its completion. Among the 20 victims is Okou, the lover of Yokichi, a member of the theatrical entertainment district controlled by Samon Kamiyama. A body of a bridge carpenter is also found in the debris causing Samon to suspect the construction, which prompts him to launch an investigation. The superintendent, Horitome Tamba rules ...