Umayon

The horse girls are back to charm you in this special, bite-size anime. Umayon comes alive as a cute and eye-catching anime! At a school-turned-training facility, the girls will race, perform, and train... but that's not all! Saddle up for a short-form anime that displays the laidback school days of the horse girls! Aaaaand, they're off!

(Source: Crunchyroll)