I'm not sure where you're getting 20 from in terms of sex? For example for Tokyo I can't seem to find anything that'd suggest it being more than 18, which is also the legal age for marrying... and apparently adulthood too since last year. Granted, I can't recall if Anemone is placed in Tokyo or if it is even specified. At any rate you don't have to be a legal adult to legally have sex, after all. For example where I live it's 18 for adulthood and marriage, but 16 for sex... although that does rise to 18 if there's an "authority" factor involved like with a student and teacher.
So, no, a young girl spending year fawning over a sexy school nurse in the hope that one day she reciprocate her feeling is not grooming. It's literaly the opposite.
But well, retard will be retard...
Yeah, I gotta say that grooming really seems to be such an overused - and more importantly
misused - word, and I don't mean just in this particular thread. Kinda makes the word lose its meaning.
But speaking of something like this specific scenario, even if it
was real life, and people calling it gross... seems to me it's really not that simple. You indeed have a girl pursuing an older woman for
years, which would clearly be more than some passing youthful spur of the moment thing. Is it inconceivable a teacher would fall for a smart, driven student like her over time? Since she's graduating she should probably be 18 already at this point
and is the pursuer rather than the pursued, I just don't see how the teacher would be gross - she's kept from stepping over the line all this time despite the "relentless" advances, so if anything she's being very mindful of the circumstances. Some gross depraved pervert wouldn't bother holding back. The teacher's age isn't specified, I reckon 25+ minimum since she was already a teacher/nurse 3-4 years ago at least, but it doesn't even matter that much. It doesn't invalidate it being possible for both parties to honestly love each other in a healthy way. And as long as it's also legal like it would seem to be in this case, who's got the right to call it gross in the end? People often call things gross/wrong/etc. and even want to ban them even when it has nothing to do with them. Stuff like homophobia for example.
There are definitely some
very questionable romance portrayals in manga, but to me this one seems to be on the mild side. And on a bit of a side tangent I still find it somewhat funny when people freak out over fictional depictions of romance and sex, but at the same time don't bat an eye on fictional depictions of killing people and stuff like that. Or of course simply another manga favorite: child soldiers, even if the thing they're fighting isn't other humans. On which note, incidentally a child soldier is someone under 18, while at 18 you can legally become a soldier in most places, Japan included. If an 18-year-old couldn't consensually legally date/have sex with someone older than them but could legally have killing people as their job... yeah, talk about absurd.