猫娘症候群(かとるすしんどろーむ)

Shirakaba Yuki is a girl with the Catulus syndrome, which afflicts her with cat ears and a tail, plus some behavior like a cat. In the middle of her high school entrance ceremony, Ayano Riko - who is also a first year - comes in with a mountain of cats on her back. Apparently she's a cat magnet. They become friends.