Yankee ni Deshiiri Saremashite.

Urara is an ordinary high school girl who loves cats and is loved by them. Today, seeking solace from cats, she visits her secret hideout where she can interact with many stray cats. There, she is approached by Hyuuga Izumi, a delinquent covered in blood, who asks to be certified as a "kitty master" and become her apprentice...!?

(Source: Kodansha, translated)