Sari, a married woman who cannot let go of her womanhood, lies to her husband and goes on a hot spring trip with her lover, Eiyuu. While worrying that her husband might find out, she is consumed by sex, driven by her love and instincts. She is penetrated by a manly cock from morning to night, having intense sex unlike her husband's, and forgets her love for her husband... three forbidden days that she cannot tell anyone about, going crazy with lust.