I will say this from the beginning, before writing a detailed review: I liked the drama.
Which is strange, because when I started watching it was like: OMG, why do they play so poorly? What is this with the dialogues and faces? But somewhere around episode 3 or 4 it really took me in. In the end I really enjoyed it and would love to see the continuation.
Maybe the actors needed some time to roll in as well. I liked the girl, who in the end sounded and looked really sincere, when talking to Takane, and I liked this superfluous way of speaking that Takane has. Though the drama is really short, you manage to understand the character of each of the 4 main leads. They are all different, and though due to lack of time in the series they are all quite schematic, you do see the difference. That is more, than many other dramas can boast, in which charachters often seem to be made by one sample.
Besides, do remember that Japanese have very peculiar sense of humour, which you should also be ready for while watching this drama. Hope you'll enjoy it too!