Takami Shinjo and her husband Yukio celebrate 30 years of marriage. Having started dating in college, they raised their children and now face a new chapter. Yukio has always had a playful streak, and even after marriage, he couldn't resist pursuing other women. In response, Takami began cheating as well, causing turmoil in their relationship. Overcoming these struggles, they've now become a devoted couple. They're setting off on a long-overdue hot spring trip together, just the two of them.