While I have no qualms of Azuki getting back together with Meguru (like seriously Meguru has such an amazingly healthy mindset that allows her to realize her own faults and accept others', really a great girl for Azuki), it's a shame that it feels like this ending just completely disregard Remu's feelings for Azuki. I'm pretty certain she has also developed romantic feelings for Azuki, and if this story has been longer, there may be a more dramatic love triangle playing out, and I would be content with either endgame, as long as the other girl's feelings is properly addressed.
There's also the lack of development or resolve for Niji, but that girl is too much a lost cause that I doubt she'd get on good terms with Remu even if this manga did get to be longer, still we could have got to explore more on her character.