[This review covers the first 3 volumes]. This was a very cosy read. The art is on the cute side, the story is full of fun tropes (who doesn't love an oblivious heroine and a comeuppance plot?), and the pace is smooth and easy with mostly low stakes.
Even the things that should be important and scary are downplayed, for example, the Saint's home country is supposed to be on the verge of ruin because she's been banished, but nothing has actually happened to it. The dragon that appears to wreak havoc ends up scolding the stupid prince and then leaving - hardly a grimdark consequence.
Honestly, I got a little bored by the third volume because as fun as Elaine's ditzy routine was originally, it hasn't really developed into anything meatier. Theoretically, the fake saint who has supplanted Elaine is evil in some way, but again, nothing has come of it. I don't think I'll continue with this series because it's the low stakes have left me very uninvested.
Overall, a fluff piece that is perfect for someone wanting a light-hearted romp, but lacks depth and intrigue.