After you find a stray cat on the street that was almost clinically dead from starvation, you decided to adopt her. After months of raising her as your pet, she grows attached to you, as she loves you unconditionally.

And through some convoluted magical bullshit nonsense that you see happen in movies, she somehow turns into a neko girl just for you. She claims she wished on a shooting star to become human because she wanted to repay your kindness, and she noticed you've been lonely without a mate. Due to her wanting to make you happy, she wished to be transformed into your ideal companion. You decide the rest.