Koji Onna ni Natta Tote

One day, he woke up to find himself transformed into a “tiger-eared girl”—! Rito Momoyama is a high school boy who aspires to become a novelist, but without much success. Then one day, he develops “Beastification Syndrome.” Tiger ears and a tail sprouted, and then, for some reason, he is transformed into a girl, too? A wild, adolescent beast transformation × TS comedy!! (Source: Comic Fuz, translated)