Umamusume: Cinderella GrayUmamusume: Cinderella Gray.

Umamusume: Cinderella Gray (ウマ娘 シンデレラグレイ, Umamusume Shinderera Gurei) is a Japanese manga series written by Masafumi Sugiura and illustrated by Taiyou Kuzumi. It is a spinoff entry in the wider Umamusume: Pretty Derby franchise created by Cygames, and is based on the career of Oguri Cap. The series was serialized in Shueisha's Weekly Young Jump from June 2020 to December 2025, with its chapters having been collected in 23 tankōbon volumes.