Finally tired of getting raped in my RP trying to win the Arima Kinen with umas.

Thinking of building a medieval world-ish based on umamusume.

Got some gist of it: umas dont age after reaching late teens/adulthood but their lifespan is roughly the same as real horses (40-ish years), they get the urge to run from childhood but have 0 clue how to run so Trainers who are normal humans supervise umas running, no male umas, uma society is intricately weaved into human society due to the need to breed with humans but otherwise they run off doing their own thing in the plains, horses don't exist so ground dragons are horse expy

I love horses