Nyan Koi!

Also known as:  Nyankoi!

The TV anime series Nyan Koi! was adapted by studio AIC, based on a love-triangle comedy manga authored by Sato Fujiwara. The original story features a boy who is allergic to cats and, so, understandably hates them. Irony - and an empty can - strikes one day, however, and after breaking a "neko jizou-sama" (a statue of a cat deity), he is cursed to become a cat himself, unless he grants 100 wishes from cats. Whom, by the way, he now understands.

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Producers, official website and other details: AniDB, ANN, Wiki