At some point in the past, Yuji met Kumi Honjo, fell in love, and they had a son afterward. Later on, he passes away and his father wanted to take in Kaoru to raise him to be the next head of the Hanabishi family.
It isn’t known what their relationship was like, but it is likely they loved each other, despite never marrying. Their relationship resulted in them becoming the parents of Kaoru later in their lives.
It is unknown how their relationship was like, but after Yuji died, his father wanted to take in Kaoru to raise him into the next leader of the Hanabishi.
- In the manga, Yuji had another son with another woman, also by the name of Kaoru.
- It is not known exactly why, though.