Yuu Mochizuki is a 27-year-old married woman who tied the knot seven years ago with her college classmate, now working at a trading company. They've been undergoing fertility treatments but have no children yet. With limited romantic experience and a lack of intimacy in her marriage—her husband rarely engages in foreplay and she's never reached orgasm—she decides to take a bold step: a secret affair trip. Over a fleeting two-day, one-night romance, overwhelmed by emotions she can't put into words, she gradually falls into forbidden love. This story captures her inner turmoil, confusion, and the irresistible allure of an illicit relationship.