Overall, I would characterize it as endearing and dramatic. Although some may complain that many aspects of the plot were unbelievable (e.i. surviving a 4 story fall, everyone is male and gay...) we as anime fans must remember what we get ourselves into when we click that link. This is ANIME, it is all about suspending your disbelief and loving it despite- or even because of- its oddities.
Yes, the art wasn't superb and Sunao DOES desperately need a haircut, but it was visually easy to follow, proportional, and the men were quite attractive. And come on. It's shounen-ai. We LOVE our pretty boys.
My favorite part of the series were the characters, specifically Sora and Nao and their alter-egos. Sora was a dynamic main character, and the fact that the series was in the perspective of the seme was unconventional and refreshing. Sunao is also not a conventional uke, and although he is quite effeminate and again, NEEDS a haircut, it is always clear that he is a male- in both appearance and personality. As a couple, their development is believable and relatable. Although Yoru and Ran aren't as developed, they provide some excellent fanservice, and are additionally believable.
The story line may not be entirely realistic, but the characters are, and the anime as a whole is captivating, tear jerking, and, of course, squee-ably adorable.
