Mayuka Kitagawa, the married friend of his mother, has moved away due to her husband's job. Now, she's come back to Tokyo for the first time in a while. Yuzuru, her friend's son, feels his heart race at the sight of the woman he's secretly admired since childhood. That night, carried away by drinks and emotion, they cross the line. Though guilt-ridden, their passion gradually intensifies. Lost in pleasure without regard for place or circumstance, Yuzuru sinks deeper and deeper. For Mayuka, it's been so long since she last tasted the thrill of a man's flesh—her heart trembles, her resolve wavers, and she lets herself be swept away. Entwined in shared desire, their relationship takes on a bold new form.