Aya was raised in a strict household and managed to preserve her virginity all the way through graduation. Shortly after entering university, she got her first boyfriend and went on to date about three men. Among them, she fell in love with an older man whom she dated until graduation, eventually accepting his marriage proposal. Initially, she felt fulfilled by her husband's affection and their sex life, enjoying a satisfying marriage. But as time passed, his feelings cooled, leaving Aya frustrated and emotionally unfulfilled. One day, she opened up to an old friend who then introduced her to an older man she had met at a drinking party. Though Aya had heard rumors that her friend was intimately involved with this man, she refused to believe it—never imagining she herself would soon fall helplessly for him.