Armeria is, well, honestly kind of amazing. Not in the "amazingly good" or "amazingly bad" sense but in the, "I cannot believe someone wrote this kind of story, I have no words," sense.
Probably the best way to describe Armeria is through metaphors. Or overwrought, purple prose with flowers sparkling in the background of every page. In other words, imagine all the sickeningly sweet romance stories you thought of as a five-year-old, complete with princes and white horses and cute animals, and that's kind of what Armeria is. It's an escapist, wish-fulfillment fantasy, yes, but one of the most innocuous I've ever seen. The main protagonist is adorable and strong, her love interest is cool and suave, and everyone else are beautiful and supportive and kind. The world of Armeria is as close to a utopia as I can see, where there are real no bad guys (only gods in need of purification), the only real trouble is romcom/high-school hijinks, and everyone is genuinely kind deep down.
Armeria is so tooth-achingly sweet, in fact, that I can't help but wonder if this is all an elaborate attempt at trolling shoujo romance readers: taking all the sweetest tropes and playing them completely, utterly straight with really, really fantastic art. It's kind of a series that I can enjoy only if I don't take anything seriously.
Otherwise, it's a great recommendation for younger readers (I think). The only issue is that the characters are (supposedly) in high school, but the plot is definitely down in the elementary/middle-school level.