Going straight to the point, now that everything is fresh in my head:
I'm going to start by saying that I was watching two animes at the same time: Kuzu no honkai and Tsuki ga kirei.
Tsuki ga kirei is a warm comforting blanket that wraps you in a cold rainy night. It's a romance with not much drama, slow pace and adorable moments. I didn't feel like the pace was annoying because the whole story is structured in a way that you just acknowledge from the beginning this isn't some raging passion between two steamy teenagers but a pure, innocent, and very much real love slowly growing between two very nice kids.
it makes sense, it has coherence, it has realism, and is refreshing to see this slice of life put into animation. I didn't feel bored even with the slow pace. And I even felt some gut-wrenching moments in one or two episodes.
This was the only thing I need to point out that... it was VERY bad. I understand the simplicity but the digital animations were horrible and the characters were too flat! The light/shadow ratio was absolutely terrible.
Meh. Nothing I'll remember.
I like the characters because of their simplicity. There were times where you'll probably wish to see a bit more into other character's lives but I'd say I'm pretty satisfied with the overall thing.
If you are a hardcore masochist who is into NTR and can't stand to see a happy end and no painful twists that shatter your soul *cough* (kuzu no honkai) *cough*, this will not satisfy you :D But if you want to watch something beautiful (not the animation, the story, THE STORY) and pure-hearted, definitely watch this! Watch it while drinking a cup of warm chocolate and you'll feel that the universe and this world are kind, are good, and that Mondays aren't so bad after all.
Overall: Watch it. It's lovely.