Pen Pen made the first move because she was captivated by the art, this is so nice.
And you can totally see her smile in the last page, as subtle as it is
Dang they were so sweet in the beginning, especially Neru since shes the wildest later on. Its also interesting how much of a badass Pen Pen was when meeting Neru for the first time.
I guess the author is slightly retconning how Penpen met Neru in Asobi Asobase? Granted, the Neru and Penpen's personalities in OuPara are more in line with the final parts of Asobi Asobase but I'm going to miss how they were portrayed initially.