You might think it's a stupid manga, with nothing more than those "she seduces him-he falls for it" scene... But actually, this manga shows the story of not only Rin and Aoki, but also the other characters including their past, their way of thinking and reacting to things in a more detailed way. Also, what's interesting is there you don't see only one kind of love and the characters aren't all "normal"! You get to see different kinds of love including those who are legal and those who aren't, and you get to see different kind of personalities. Some characters even have personality dissorders which makes it kinda like a psychological manga. And lastly, the messages it gives are extremely interesting and mature. Ah...and since it has to do with school, you'll see Aoki caught up in some of students problems, which he solves surprisingly well.
In this anime you'll find, like, the dark and bright sides and the characters that almost 50% or maybe more of population has it. But isn't it alright? You'll experience different personalities that are weird but make sense in a way. Instead of reading those usual love stories, I think Kodomo No Jikan is much worth it.
Also there aren't any hard H scenes. I think it says Ecchi because there are some bathtub scenes with two or more women and there their chests are visible. The other ecchi scenes are, like, "level 1" and are rare.
