UmaYon is a spin-off series of Uma Musume Pretty Derby, first revealed as a four-panel comic in 2018 with later on receiving an animated version in 2020.
UmaYon - Mini Comics! is the Uma Musume franchises own four-panel comic series. Each chapter focuses on a handful of characters in this slice-of-life comedy manga spinoff.
Anime
The Anime version was first announced on December 15th 2018, with the second promotional video being shown on March 22nd 2020. It started airing on July 7th. The Anime version has original storylines not seen in the comics.