My Little Demon Pet God

I "picked up" a cat when I went out to buy groceries. Not only did this cat deliver it to my door, it could also understand human speech. Help her teach the scumbag a lesson and save her life. The key point is: it can also turn into a human... "I can only turn into a human at night. As long as you don't let anyone find out... Besides, we have signed a contract. If I leave you, I will be weak and die." How can you not love such a cat who pretends to be good, acts cute, and begs to be taken in?