Pursuing a string of murders involving corpses drained of blood, Kuroko and her hulking buddy, Urara, descend into the sewers to rescue Narumi from an all–too–familiar face. Narumi herself is determined to escape with her fellow captives, but between her broken leg and the mazelike underground tunnels, their odds of escape are grim. It’s a race against the clock as the killer prepares for their next meal...!