20-year-old freshman Ayachan is a pure girl with little romantic experience, having dated only one person in her life. While she desires to take the lead in relationships, she tends to be somewhat passive when it comes to sex. She harbors mixed feelings about her large breasts. Despite having H-cup breasts, she rarely gets the chance to use them, which leaves her feeling lonely. Through learning techniques to satisfy men using her breasts, she gradually regains her confidence. Experience the allure of Ayachan's breast-centered romance.