MY ROOMMATE IS A CAT

Subaru Mikazuki is a writer who lost both parents in an accident. He rarely goes outside and finds interacting with people an annoyance because they intrude on his imagination. However, his encounter with a stray cat gives him inspiration for a new novel. As Subaru and Haru grow closer, Subaru slowly finds his world expanding, as Haru helps him remember what having a family is like. (Source: Lezhin) — Description from AniList community (anilist.co).