First of all, Nao and Uehara did enjoy their time together, it really comes out even without having rea the manga (which I have since then). Everybody says the actor wasn't showing emotions, I disagree: I remember him smiling, sometimes looking extremely kind but at the beginning. Of course bc his character starts to melt up slowly when getting familiar, then becoming friends and then lovers with Nao. I don't understand how you guys don't see all this here, sorry.

Some may say here, in the manga Uehara was nicer. Well, I've just finished reading, most of the time we can't even see his face, only his back, and yup, when we get his face, it is not always smiling (it'd be ooc btw). He sometimes smiles but most of the time he does not give a damn to anything, except Nao.
Anyway, a one-sided character, there was not much to do about him. I think the actor did the role well. Honestly, even at Twilight it is the same with Edward, there's nothing much about the character except for that he must be hot, uninterested, cold and so on... But that's the same with every other shoujou stuff.
I wouldn't say that the actor was more terrible than eg. the one in the 1st L-DK movie (imo) or any other typical shoujou. It is just that story is from the girl's perspective as always. If we consider L-DK here as a comparison, I prefer this one bc it was a bit more realistic, L-DK was way too 'high in the clouds' especially the girl.

About the acting, I didn't like the FL first but later she became better, more into character and I really like her now as an actress. I LIKE Shiraishi Shunya as an actor (I'm currently watching his Kamen Rider) but after coming here I also came to the sad realisation that I'm probably the only one or at least in the minority with this opinion. Anyway, I stick with it. I think people who don't like him they haved probably never watched pretty bad acting in doramas. Well, I have and I really think that this is not a bad one, maybe so many of you feel it so bc the actor's eyes is a bit unusual and his mimics were that too. However, it certainly isn't the worst I've ever seen in my life.
Other actors were great here too, Sakurada Dori and Tanaka Kei never gives his name to a story that is not worth at least a lil bit. So as for actors/actresses this dorama certainly is a good kickstarter, also a cheerful, fluffy dorama for boring days, only that with a bit of a boring plot (at the end their problems is a bit repetitive) but definitely a good one.

BTW all is the same in the manga (yes, Uehara too), only some minor changes so I don't understand why people here are angry with the outcome, it is very well adapted, that's just another thing that some people seem not to like the original story itself. But if so, why blame the dorama? they should take the blame (if they want that so much) on the mangaka, not on the dorama... Anyway, I even liked its 2nd season more as their story has matured a lot (which in the manga hasn't), their character too, and not to mention everybody's acting has just got better and better.

I recommend this dorama, its 2nd season even more, it is available on Netflix and if you like school romcoms like this then I really think it is a must for you!!