Due to declining customers amid changing times, a bathhouse-owning father and his daughter, who harbors an incestuous obsession, struggle to keep their business alive. As they brainstorm ways to gather girls for secret filming, they devise a scheme to invite their real nieces to the bathhouse. Under the pretense of offering special service by carefully washing each guest, they grope the girls with lewd, suggestive touches, eventually escalating into an outrageous orgy within the bathhouse. This disturbing scene, unfolding in the nostalgic atmosphere of a traditional bathhouse, pulls viewers into a whirlpool of dread and arousal.