Wait, I've reread some parts and... is Juuzen the younger brother of the boxer Hosaka got ...

I thought the same thing too but when i look to their last names their were different, well i was a bit disappointed because i thought it would interesting

BUt, hey, didn't his mother remarry and he did say at the start he still wasn't used to his last name so maybe the event in Komatta happened before the remarriage. I actually only thought of this after you mentioned the last name so, yeah. I like relating this manga to Komatta because I really love both.

Well that can happen too

Oh, that actually makes sense. Though his little brother wanted to become a boxer, right?