Minatsuki is a Japanese manga writer and original creator, best known as the author of the manga series My Roommate is a Cat. The creator is also identified as Tsunami Minatsuki, born on June 6 in Chiba Prefecture, Japan. The name Minatsuki serves as a pen name for manga publications.

The creator's most prominent work is the original manga My Roommate is a Cat, which began serialization in June 2015. The manga is published by Flex Comix and runs in the Comic Polaris website. The story follows a reclusive novelist who adopts a stray cat, with the narrative alternating between the perspectives of both the human and the animal. The manga received an anime television adaptation that aired from January to March 2019. The anime was produced by the studio Zero-G and directed by Kaoru Suzuki. In the credits for the anime series, Minatsuki is officially listed as the original creator, with the manga credited as being written by Minatsuki and illustrated by Asu Futatsuya.

Beyond this signature work, Minatsuki is also credited as the writer for a series titled Colocataires à leur manière, which has been published in multiple volumes. Additionally, the creator is known to have drawn Taiyou no Uta. The creator works primarily as a manga author and writer, distinct from any role in voice acting. The artistic identity centers on character-driven, gentle narratives that explore the formation of unconventional families and the quiet development of human relationships.