Mao was happily married to Kazuo, her senior from a university club who later became her boss at work. Surrounded by her kind and ideal husband, Mao felt truly fulfilled. However, one day, a man came to their home for a business meeting—Horio, Kazuo's best friend and Mao's former boyfriend. At their reunion, Mao couldn't hide her shock and confusion. At that time, Kazuo was still unaware of Horio's existence. Horio had rekindled his romantic feelings for Mao and began pursuing her again. Yet faced with the reality that she was now Kazuo's wife, Mao found herself torn over what to do.