I've read both Katsu! and Rough, and it always seems that the father of one family hates the father of the other for whatever reason. It's not exactly like Romeo and Juliet, but it's similar. Katsu! had two rival boxers, and Rough had two rival confectioners. Strangely, Cross Game is different. The fathers there are friends.

Now I need to read Adachi's famous works, notably H2 and Touch. I've read two of his lesser works and reading his currently running work.