A Man and His Cat, Vol. 1 by Umi Sakurai

A kitten languishes in a pet shop, unwanted and unloved. Even as his price drops with each passing day, no one spares him a glance unless it's to call him names. Having practically given up on life, the kitty himself is most shocked of all when an older gentleman comes into the store and wants to take him home! Will the man and the cat find what they're looking for..in each other?

Wholesome and tear-inducing.

I need to stop reading cat mangas because they always make me cry!

An older man adopts an unloved, unwanted kitten to fill an empty house, and together the two start building a (super cute) life together. Fukumaru discovers what it's like to be loved, wanted, and spoiled, while Kana (the man) remembers what it's like to have someone to come home to again.

I'm not entirely sure I can convey how incredibly wholesome this manga is. There's evidently some loss or tragedy in Kana's past that we haven't explored yet, but Fukumaru learning what it means to be someone's pet is incredibly sweet and cute. It took me forever to find a copy of volume 1, and already I can't wait to get volume 2!