I really liked The Flower and the Star's confession, which lasts a few pages. It was beautifully built up.
And then you have the reply, that also lasts a few pages (thinking back, this whole chapter's one big confession and its reply)
If you havent read it you shouldn't read those pages haha, it's so much more satisfying if you actually read it
I guess I could have given the link to the exact page where you have the confession plainly stated, but what made them memorable, stuck with me and were the first to come to mind was the way they were built up, their narrative and visual value
Any other bipolar manga where people were screaming at each other and crying and in the next panel would laugh it off with a joke again would have been on my shit-list immideatly, but you can actually understand those misunderstanding and the author prepared us for those more intense moments in the funnier bits with exxegerated art styles.
I have to say though, not the confession scene Nez was thinking of but I found this one to be the most beautiful part in the story, the attempt that failed