The name of the titular character "Koinu" means "puppy" in Japanese.
Based on a Japanese manga series written and illustrated by Ukauka. Uka Uka launched the manga on Souffle, the manga website run by the editors of Akita Shoten's Elegance Eve magazine, in 2020. Akita Shoten published the manga's first compiled book volume in May 2021, and the fifth volume on January 16.