Gū-Gū Datte Neko de Aru

Overview

After Ooshima's cat named Sava suddenly dies, she finds it difficult to continue creating manga. However, with the help of a new kitten named Guu Guu who shows up, she’s able to get over the loss of Sava and eventually feels inspired to continue her work. When she gets the horrible news that she’s been diagnosed with cancer, she’s devastated at first, but soon finds some new perspective on life and death.

Source: AniList