Shigeo and Yuko's silver wedding anniversary, celebrating their twenty-fifth year of marriage. For this occasion, their daughter Kiriko and her fiancé Yuji planned a hot spring trip for the group. Since Kiriko grew up, there had been no opportunities for family outings, so Yuko enjoyed soaking in the open-air hot spring while chatting with Kiriko. However, there was a man who stared at Yuko with a lecherous gaze. That night, after Shigeo and Kiriko got drunk, Yuji took action…
