I've decided to read this manga after watching the anime, it was quite a good surprise even though it's just your casual, fluffy romcom. I wouldn't really qualify this manga as "Ecchi", since it offers little to 0 fanservice (most of the scenes happen in Ao's head and don't occur in real-life), but instead the scenes are just sweet and sort of innocent, contrasting to Ao's inner personality (closet pervert).
Even though the series gets published in a monthly magazine so there are only a few chapters (38 so far to this date), the pacing is actually entertaining and fluid which makes you feel attached
to the characters and actually caring about their relationship. The story is kinda predictable, but we're not looking for anything exceptional, just something cute to read before going to sleep. The plot is rather plain, some scenes are pretty comedic but I wouldn't say funny. I wouldn't recommend it if you're looking for a romance with a consistent plot, character developement or realistic theme.
Speaking of character developement, it actually exists but is poorly executed : anyone beside the main cast doesn't really matter and they don't bring any developement to Ao or Kijima. Ao herself is the hard-working girl who's awkward with romance and has prejudices with men, meanwhile Kijima is the popular handsome classmate who's actually inexperienced with romance and fell in love for Ao on the first sight. The two of them are rather shippable, they do have a lot of cute moments together like Kijima struggling to tell her how he feels and Ao being embarrassed. We get to see the two of them grow as a couple and I find it quite lovely.
The art is acceptable, definitely not amazing but some panels managed to bring the emotions to the readers.
Overall, enjoying this manga or not totally depends on you, but if you don't mind spending few hours reading a rather cute romance just to relax, then definitely give it a try. I stopped reading romcom a few years ago after getting bored, this one actually surprised me to the point of writing a review.