Yayoi, a woman with a weak personality who struggles to say no, was introduced to a traveling host by a senior colleague from her former workplace while preparing for marriage. As usual, her inability to resist led her to accept the arrangement. Easily swayed and susceptible to temptation, she gradually falls into a depraved relationship. Along the way, she experiences the unknown pleasure of first-time sex, becoming captivated by its intense thrill and allure. Her inner self begins to transform, giving rise to new emotions and desires.