Guys, did you realy think something like this was not coming? He even mentioned the eventual appearence of tidy, black-haired serious kind of girl several chapters earlier after all, besides, with this kind of art and effort, the manga can't really rely on 2 MCs, most of y'all are probably afraid of annoying rival girl trope destroying the idylic pace we had up until now but author so far has been subverting most tropes and not puting out the bad ones so I think we can rest easy and enjoy the ride.