Ok so ignoring the legality of it, it's probably legal where ever this takes place anyways as I doubt it's America, we have love between two characters, of which is most likely do to the pretty flower signifying Yuri behind them in some frame, and yet when I look at these characters i see a rather mature looking girl and another that looks of a child? I'm not the only one who finds this jarring right? It's the same in present to only it's an adult not a mature looking girl, which makes it worse in my opinion
It looks like a teacher and her student man, can't we just use characters that closer in age? Or at least look like they are
Oh I see, some people like age gaps, I see I should ignore it and move on them, not my cup of tea