>>714694112
The first five minutes of the game explain this but sure, I'll take the bait. They're humanoids with horse ears and horse tails who have all the speed and power of a normal horse. Their spirits are those of famous horses from our world. Their destinies are those of famous horses from our world. You're not meant to take this to mean 'but wait how does this effect the setting?' It's not that serious. It's a largely humorous racing game where horses that Japanese people like are now cute waifu's that will run for them. That's all.