Nyan Koi centers around a boy who is allergic to cats. He accidentally breaks a cat statue, which pisses off the cat god, so he's cursed to turn into a cat unless he can do 100 good deeds for them in a timely manner. You can see why this would be difficult. Oh, it's also a harem anime.
I loved Nyan Koi. Fucking catgirls everywhere. And those twins?
Also, the hentai prince and the stony cat should be mentioned here. Perverted kid and girl make wishes, hilarity ensues.Tsukiko Tsutsukakushi is so fucking moe it should be illegal.
Kitty, I can't remember if I mentioned Kirino Mosaic or not, but it's worth mentioning again since season two was just confirmed for this Spring.
Adorable girls doing adorable things. Engrish everywhere. Expect nothing but cute. It's secretly a whole lot of fun.