37-year-old extremely lustful milf Itsuki Azuma embarks on a humiliating trip to Kinugawa Onsen. The moment she arrives at the hot spring, she immediately takes a man's penis into her mouth, writhing in ecstasy from the sensation. With her deeply masochistic nature, Itsuki attempts to control her arousal by repeatedly performing fellatio, but gradually loses all sense of reason, completely surrendering herself to her own desires.