I read all three of them so far, and they're all absolutely charming and cozy. I feel like super cozy books are very trendy right now and that's probably related to the popularity, though I really have no idea why they are so incredibly popular as opposed to other cozy books, as I would put them at like a 4 out of 5 - I liked them a lot and will definitely read any future translated ones in the series, but they never kept me up at night. Maybe Booktok is a factor?