In the "Mukaiyu" electric bathhouse, a seemingly ordinary afternoon lurks in danger. Ingami Yokichi came to take a bath as usual, but as soon as he dipped his towel into the bathtub, he suffered a strong sting and was electrocuted and fell to the ground. At the same time, the body of a young woman was discovered in the women's bathhouse, with a blowgun stuck in her neck, and the scene was stained with blood. The bathhouse waiter Yuzo also died mysteriously on the mezzanine of the ceiling, and was also killed by a blowgun. As the investigation deepened, strange items such as a telescope and a movie camera were found in the mezzanine of the ceiling, and many mysteries such as the missing clothes of the female corpse also emerged. Director of Justice Akabane Naozo works hard to find the truth. So, who is the real culprit behind this serial murder case?
