I guess I don't really understand why people are in an uproar over interactions between children. I could see why someone might be uneasy if one of these characters happened to be an adult (are adults even shown in this series at all?), but some of the responses I've seen here are either completely blowing things out of proportion or talking about things that haven't even happened yet without using spoiler quotes. I'm not sure which.
I believe it comes down to people's answer to the following: "is it still lolicon if they're both minors?"
After thinking about this for quite a while, even I don't have a concrete answer for this, yes or no. In the majority of cases, I would probably say no, but I can't deny that there are occasions and scenarios where it would be yes. An extremely mature teenager being in love with a small girl would definitely be jarring. But that isn't what we see here; not even close.
If at some point, the author decides to go the route of an actual coupling of a high schooler and elementary schooler, I would understand people's uneasiness. But until that point, there really isn't a purpose to the drive-by morality policing posts.