My Cute Little Kitten manga volume 1 features story and art by Milk Morinaga.

Rena has had a crush on her roommate Yuna since college, but Yuna has never noticed. One night, Yuna brings home a tiny kitten, even though their apartment doesn’t allow pets! Rena decides it would be better to let Yuna find her own place. But when Yuna says she wants to stay with Rena forever, Rena’s feelings are forced to the surface. Can Rena make Yuna understand what being together forever really means?