One day, I went on a trip to a hot spring with her best friend and her partner, and when I met her for the first time, I fell in love with her at first sight because she was my ideal type. However, when I found out that she was engaged to her boyfriend, I was heartbroken. That night, when Yuka headed to the hot spring alone, I couldn't think of anything else to do, so I followed her, even though I knew it was wrong...