i hope it's childcare and not clickbait

She is 8 and he is 12, there is a high chance they will end up together once they are old enough.

wtf the cover shows a grown-ass man holding a little kid. Am I losing my eyesight?

In the miniature version of the cover it my look like this, but if you zoom in, she is standing next to him, and he only has his hand on her shoulder, also his features are younger. He still looks more like 14, but in the manga itself he looks younger.