Kyouka Aikawa, a seductive and alluring married woman, struggles with her husband's repeated affairs with a geisha from Gion. Confiding in her husband's older brother, she gradually develops an emotional and physical bond with him. Left unfulfilled by sex only once a month, her inner longing intensifies until she finally decides to embark on a two-day, one-night illicit journey. This trip becomes a turning point, opening new horizons in their forbidden relationship.