I Found a Poor Young Lady and Said She Wanted to Be My Cat.

Yu Qinglu transformed into a moonlit night, swung her tail and ordered Chen Mu: "Human, from today on you are my servant!" In order to protect her from awakening her spiritual power, Chen Mu took the Night Watcher's soul-eating chain with his bare hands: "You touched my cat, have you asked me?" During the final battle, Yu Qinglu burned her seven tails and disappeared on the verge of death. Chen Mu held the collar and sat in the rainy night for three years - until one day, the little black cat jumped into his arms with half a compass in its mouth. In the seemingly ordinary modern city, there are monsters and psychics from other worlds hidden. Yu Qinglu, the eldest daughter of the Yu family in Jiuzhou Continent, was exiled to modern times due to family conspiracy. She turned into a black cat that lost her demonic power and was picked up and brought home by the scrapyard owner Chen Mu.