Daigo is enchanted by his wife's friend Kayaha's visit, captivated by her beauty. Unlike his usual harsh wife, Yuka, he finds himself drawn to Kayaha's gentle demeanor. Then, Yuka suddenly leaves for work, leaving Daigo alone with Kayaha. Enjoying this brief honeymoon feeling, Daigo is too excited to sleep. One night, he happens to stay up and ends up drinking with Kayaha. As he listens to her troubles, their distance shrinks. During Yuka's absence, their lips不知不觉地重叠在一起。
