Leisurely housewife Mio possesses a refined appearance and noble demeanor, yet secretly, her husband forces her to wear only fundoshi-style underwear as part of his control over her sexuality. Her body has been drawn into various sexual games by her husband, leaving her trembling and quivering like a fully exposed woman, increasingly craving pleasure. One day, a security guard suddenly appears at her door. Seeking new excitement, her husband orders Mio to seduce the man. Using the seductive charm and physical responsiveness she's developed throughout her life, Mio prepares herself for this new challenge.