"I ended up lying to my husband..." worries 25-year-old Sara Yurikawa, a married woman. A year ago, she met a younger man while working part-time, and gradually grew close to him, eventually beginning an affair. Their relationship has become so routine that secret rendezvous are now an ordinary part of their lives. Now, the two plan a two-day, one-night hot spring trip together, setting off on a journey to create new memories.