Wasteland, Starting with the City Lord's Daughter's Cat

The protagonist traveled to a wasteland world and turned into a cat. His owner was the city lord's daughter. This owner is good at everything. He loves his cat to death, but there is one bad thing about him: he petted the cat at every turn. Cats are proud animals. How can they be petted and played with by humans? It's better to kill them! Fortunately, the protagonist has acquired a sharp system, allowing him to become a magician, enough to trample his master underfoot. Protagonist: "Who is the master?" The city lord's daughter: "My cute cat is the owner and I am the pet." Protagonist: "Remember, I'm not cute, I'm fierce!" The city lord's daughter actually ignored it... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.