I'm not beautiful, but I'm dating a girl with a good personality, and I'm starting to think about marriage. One day, I met her best friend Jun for the first time when I went on a hot spring trip with her best friend couple, and I fell in love at first sight with my ideal type. However, she finds out that Jun is engaged to her boyfriend, and she is heartbroken. That night, I saw Jun's beautiful body in her mixed bathing hot spring, and I forcibly formed a relationship with her, even though I knew she was no good.