Man they really need more hugging and stuff like that, that's were the real shit comes in!
And the age gap is fine as long as its not too big. For example, because this is a manga with a fluffy type art style, this girl can be from 14 to 18 and the kid can be from 5 to 13 (he's playing hide and seek but it's really hard to tell when people stop playing this type of games), so as long as the kid is like 12 and the girl is 15 or less it's not that big of a deal, but if the girl is around 16 and the kid is like 6-9 that's fucked up on a lot of fucking levels. That's it rant over.