The [kiss -> "dont fall in love with me"] combo is brutal
Another one of my favourite scenes is last chapter where it turns out that Touko's sister wasn't as perfect as Touko thought. The whole "putting up an act" theme of this manga is really good.
Yes I came back after finishing the manga 2 months ago to say this because these are among the top 4 scenes along with the gym supplies scene (just the sheer emotions that Yuu felt) and
Yuu's confession scene which went wrong but made Touko realise how much of an ass she was