Romance and comedy, without showing any ecchi sounds like an anime that wouldn't be popular, unless done beautifully. This anime showed almost no ecchi and personally, this anime succeeded with flying colours.
Rom/com stories are usually the hardest to make, mainly because it can get boring if the jokes aren't funny or the romance isn't working out and people don't like it. Gekkan Shoujo Nozaki-Kun, did both of those mentioned beautifully. It wasn't boring at all, though I couldn't find much story in the anime, though the jokes made up for it. The story personally didn't drag out a lot, for an anime that doesn't have a lot of story. The comedy in this anime is very random and unexpected and sometimes may leave you laughing or cringing. The romance(s) in the anime isn't too developed, but I think that's for the better. If there is a relationship, then there will always be a breakup. Drama in this anime would have disappointed me, because sometimes it can get annoying. Moving aside, the only story I could dig out of the anime was relationship developments.
The art is pretty refined and smooth and something about Sakura's facial features remind me of someone. The art is very nice, vibrant and happy. The animation is very smooth, not choppy. I just realised for there are a lot of different types of eye designs in the anime.
The sound section for me is probably the most boring to review, if the OP or ED is mediocre or boring. The only thing I could comment on the anime is the beautiful piano soundtracks that impact the scenes.
I would think that this is the first time to put a full score on characters, because the side or main characters are unique, random and have their own loveable characteristics, such as Seo's carelessness. Nozaki was the dense type of character but he's actually likeable, because he can turn any awkward moment into a funny moment. Sometimes, he can be random and that's why I also like him. Sakura has a massive crush on Nozaki, but everytime she tries to be romantic, it always turns into a funny scene. She is very cute and isn't very needy or selfish, unlike other female characters. She's very kind and gentle to other people, especially people who are her friends. There are also a lot of relationships developing throughout the anime, which is very cute and their relationship is very funny, due to their reactions to each other.
Enjoyed this anime a lot, since I would watch it on my phone until 12 am. Damn, sleeping schedules are screwed up. There is never an episode where I wouldn't laugh or even giggle at all, because this anime is too funny.
Overall, a 9/10. The reason it isn't a perfect 10 is because there are a lot of anime which do Rom-com genre and it gets overused. Yes, this anime did it succesfully but if it was a bit more unique, then I would've given it a 10/10. Would I rewatch this? Yes, if I ever want a laugh.