Kozue, a veteran office lady with over 20 years at a credit union, has always valued her role as a mother of two. However, she is now considering divorce from her husband—due to an affair with a younger, 6-year junior male colleague in the same company. Hoping to build a future with him and remarry, she accepts his invitation for a one-night, two-day hot spring trip. On this journey, their relationship deepens beyond expectations...