My Kitten Girlfriend is a story of love, friendship, and the world of cats. 

The main character is a man who loves cats. One day, he finds a cat abandoned in front of his office building. He decides to take it in as his own and starts to feel like it is his home. But then it runs away from home. 

The protagonist is disappointed but he keeps looking for the cat. After a few days, he finds it again. This time, it is on the side of the road. He thinks that it is trying to take him to its home but it turns out to be a trap. 

The girl is the one who wants to repay him. She wants to give him something to help him feel better. She takes him to a mysterious world of creatures like her.