The show starts a little slow and there are probably a few too many unnecessarily long scenes in it, but the characters of Ruka and Makoto are really well thought out, and as a viewer you grow attached to them. The story is cute too.
HOWEVER.
MAJOR spoiler alert!
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No happy ending.
For me this is the weakest part of this show. Although for some more serious series a sad ending works just fine (provided you are into crying & drama, which honestly I'm not), this show wasn't really meant as a very deep thought-provoking work of art, and it really deserved a happy ending. I found the sad ending cliche, I've seen this a million times before in different settings. It would've definitely been more refreshing if the screenwriters had found a way to give us a happy non-toxic non-sacrifical ending instead.