Tsureneko: Maruru to Hachi

Maruru lived a pampered life till one day, he ran after a flock of sparrows and couldn't find his way back home. He encounters Hachi, a tough stray, who says he doesn't need a spoiled house cat on his territory and chases him away. But then Maruru helps Hachi out of a jam, and they team up to face life on the street together.

(Source: Seven Seas Entertainment)