"What... what are you doing, Mom!?" Kotaro exclaims in shock. After visiting a middle-aged women's specialty soapland to unwind, he's recommended a particular soap girl by the manager—only to discover it's his own mother, Hitomi. Stunned by the unexpected turn of events, Kotaro's cock instantly goes limp from shock. But seeing this, Hitomi says, "I'll definitely make it feel good—just don't tell your father," and suddenly lunges at him. From this moment on, a shocking story of incest begins.