It's not really an extraordinary manga, but that's pretty much its selling point. It's the epitome of "average" or something like that, it's not bad but it's not really that good either. It's for people who likes nostalgia and slow reads, a manga that makes you get a kind of special feeling that is pretty warm but not that much, it's absolutely not funny. It's kind of like a diary, yet it's not at the same time. It feels real, unlike many other manga, but it lacks a lot in zest.
It's not something you're likely to dislike, but I doubt it will be a favorite manga either. People are always exaggerating ratings, especially when a manga leaves such heavy feelings behind. For me, it's not my cup of tea at all, I read manga and other stuff to get away from "real life" to some extent with surreal or fantasy situations, to get some laughs or get absorbed into an extraordinary story that I can't stop reading and that keeps me happy. Even slice of life tends to offer that. This didn't, at all. If one runs out of other things to read, this might be a good thing to fill some time with, but not much more than that, and you shouldn't read all of it in one go, better to read a chapter now and then if you want to.
Well, give it a try. One or two chapters is all it should take to get a taste and feeling of how the novel will play out and what mood it brings you. For me, it was something like looking out over a sea of trees in the middle of summer when everythings green and the birds are chirping, or listening to the gentle waves of the sea while slowly fishing. It's a nice and peaceful feeling for sure, but it's not what I read manga/novels for.