I'm not handsome, but I've been dating Mari for three years and started thinking about marriage... One day, we're going on a hot spring trip with her parents. Her mother Naho, whom I'm meeting for the first time, is my ideal type because I like older women, and I fall in love at first sight. But Ms. Naoho is her mother and has a husband, so he fell out of love with her immediately after meeting. He headed to the hot spring in confusion, only to find Ms. Naoho already bathing. Despite knowing it was wrong, he couldn't help but touch her beautiful wet body…
