Tanaka, a poor student, lives cheaply in a vacant house in a suspicious, abandoned soapland. One day, he calls a delivery health girl to relax, but an unexpected situation occurs... Yurika, Maina, and Kyoko, the top female investigators of each undercover agency, infiltrate an abandoned soapland to investigate a powerful aphrodisiac. There are three types of aphrodisiac they are after. Each one is dangerous and shrouded in mystery. Meanwhile, Tanaka happens to run into them. Suspected of being a drug dealer, he is pressured by the beautiful investigators to talk without knowing anything. However, when he mistakes them for delivery health girls, the situation takes an unexpected turn. Tanaka, caught up in a very lucky situation, experiences a thrilling and sexy "filthy torture" that will lead to its outcome...