Sugimoto's crew follows rumors of a tattooed prisoner among the herring fishermen on the coast near Otaru. There they encounter Henmi, a strange, perverted serial killer. The fight between him and the gang develops into a deadly seaborne battle involving a killer whale.

The gang stays in a strange hotel, run by a former prisoner. This hotel has a dark secret, but even its wicked owner quickly finds herself overwhelmed when both Sugimoto's group and Ushiyama book rooms, and both Shiraishi and Ushiyama want to sleep with her.