One day, I went on a hot spring trip with her best friend couple and met her best friend Yuka for the first time, and I fell in love with her at first sight with my ideal type. However, when she found out that Yuka was engaged to her boyfriend, she was heartbroken. That night, when Yuka went to the hot spring alone, I couldn't think of anything, and even though I knew it was no good, I followed her.