The first chapter of the manga is available to read for free.
— LEZHIN COMICS (@LezhinComics_US) September 14, 2020
Lezhin Comics describes the manga:
The story follows mystery author and recluse Subaru Mikazuki as he meets and adopts a stray cat, Haru, after visiting his parents' memorial. Subaru has completely withdrawn from society after the tragic death of his parents, but slowly begins to open to the outside world. If only to make the occasional purchase of cat food for Haru.