A few months after the serial murder of black girls was solved. There are new unidentified bodies in the same place. The criminal policeman in charge of the investigation, Kagagu, went to Urano, the murderer he arrested with his own hands. Ueno told Kaga Valley that there was a mysterious figure like a mentor to him on the dark Internet. At the same time, a mysterious man began to approach Mineri, the lover of Kaga Valley.