Fluff. Pure fluff, which is probably what made me love this anime so much.
The storyline was pretty much predictable, so if you're looking to watch this for a unique plot, don't. If you are however looking for a cute story with great art, than you'll probably love this!
Opening and ending theme's were amazing.
The only thing that sorta put me off was the switching of the 3 (four?) couples. Other than that, it's a good anime.
But like I mentioned before, this a yaoi, and if you want a good yaoi with an actual plot, read yaoi manga.