"I was in the area so I stopped by...I see you're not home..." While his wife Shizuka was visiting her hometown, Yumi, who introduced herself as a friend, came by. When he told her that Keita was visiting his hometown and she was not home, Yumi sighed in disappointment. It turned out she had come from Hokkaido. "I got married early, so I couldn't even go to Shizuka's wedding..." Yumi, who Shizuka met in college, was a surprisingly beautiful woman. "Since we're here, why don't we go up a little?" The words he spoke without thinking led to an unexpected situation...