Because he is the male protagonist of this anime

There is a joke like this:

Hanawa said to Maruko: "When you grow up "Do you want to marry me?" Xiaowanzi said, "Oh, no. I love you very much, but I can't marry you, because in our family, you can only marry someone in your own family." , grandma marries grandpa, uncle marries aunt, it’s all like this.

"So Hanawa cried...

3. There are many people who have a good relationship with Moe Maruko-chan and Hanawa

4. Hanawa is the character in this anime A handsome guy, fans think they are a good match

Above