As a gift from the neighbor's wife, Iroha receives a sheer yukata and a special tea rumored to have aphrodisiac effects. She drinks the tea right away and soon feels her body growing hot, overwhelmed by an unusually lustful sensation. After seeing the neighbor off, she can't resist and starts masturbating right in the entrance hall. But self-pleasure isn't enough—eventually, she sets her sights on her virgin son. Iroha gives him the aphrodisiac tea and seduces him while wearing the transparent yukata. Though shocked at first, her son's cock quickly swells under the tea's influence, and he gradually gives in to arousal.