Cat in a Hot Girls' Dorm manga volume 1 features story and art by Haruki.

One day, a little gray cat is abandoned at the entrance of a girls’ dormitory. One of the girls, Himari, takes him in and gives him the name “Tama-san” or “Balls,” owing to his rather prominent testicles. Thus begins a sexy new chapter in his life, from the streets to the sheets! <3