lol come on
I get why the author went this route, it's a very... efficient way to wrap things up, but it's just a little bit too silly and convenient that an accidental kiss worked for Chieri. Would it have been more anticlimactic if the confession itself simply would've made her happy enough to turn her back? I dunno, maybe, but I can't shake the feeling that emotionally even that would've worked better.
Oh well, I can't really fault a comedy manga for going out in a comedic fashion. It's been a nice run, I'll enjoy whatever's left.