Youji told his son that he met Rumi for the first time in Hawaii, but this was a lie to keep Yuu unaware of his past. Youji dated Rumi during college, but had a falling out because she thought he was having an affair with her best friend Chiyako. Youji dearly loved Rumi, but before he could explain the situation, she left him and married Jin. Caring deeply about his friend Chiyako, he declared his intentions to marry her and raise Jin's child.