First of all, I would've gladly given this one a 6, or maybe even a 7 out of 10. But I stuck to 5 because of one glaring issue - the story isn't complete, and there is no indication of it being continued either. The sequel to the manga was cancelled, along with another from the same author simultaneously not too long ago. But don't be disheartened just yet - there's more to it. The story focuses on only two characters with steady but good development. There are a couple of side characters too, who are mostly there for comedic purposes. What I like the mostis the chemistry between the two main characters - it's not totally cliche, atleast in my experience. At the very least some of the jokes are actually funny, which is always a plus point in a world where lame jokes are taking over the comedy manga/anime genre. The author did try to get away with his laziness by not drawing the backgrounds/bg characters in full details (basically rough sketching it out). However, that is only one point of view, since this can also be seen as an artistic choice to give the main characters more emphasis/make them pop more. I'd like to think it was the latter, since I really don't think it was necessary to add that much detail to the background when you're trying to develop the main characters so dedicatedly. However, this style does has it's limits, and Yuki to Sumi seems to have hit that limit.

If you're looking for a short, and I mean a 1-2 hour read kind of short, look no further. Be warned though, the incompleteness of the story may bother you afterwards. As for me, I have mixed feelings for this one; I'm both happy and irritated that I read this :p