I have two diffrent ideas in my mind right now, and I'm really craving the first.
Plot 1) A Mage is trying to do some sort of spell and ends up bringing a cat girl into his tower instead. The cat girl is from a diffrent world where everyone is some sort of animal. Its a jungel type world where everything is pretty primitive. She would need to learn how to deal with a more modern culture ( maybe even the language) the cat girl would just want to get out of the strange planet and back home. The Mage might want to help her or have his own agenda.
Plot 2) A world renowned traveler goes to explore a part of the jungel never explored before. While he is there he encounters a cat girl, He grows fascinated by the creature and decided to bring her home as a souvenir.