Self-published as a webcomic by Sakurai before being serialized by Square Enix Manga, the series follows an older widower who adopts an unwanted cat.

Fukumaru, a large and homely Exotic Shorthair at a pet store, is regularly passed over in favor of kittens that are younger and cuter than he is.

He is unexpectedly purchased by Kanda, an older man who is recently widowed and who has a distant relationship with his adult children.

A Man and His Cat was originally self-published by Sakurai, with new entries in the series posted weekly on her Twitter and Pixiv accounts.

[36][37] Short motion comic videos have been produced to promote the release of the tankōbon editions of the series, and feature Jouji Nakata as the voice of Kanda.

[44] In 2018, A Man and His Cat was one of the top recommended manga titles in a survey of Japanese bookstore employees.