So like are horsegirls a separate species from humans? Or a subspecies or something? Do they have their own scientific name? Are they horse-like humans or human-like horses? Do actual horses even exist here or are they all just horsegirls? Am I asking too many questions about the silly horse game?
from what I know, they are horse isekai, sep race, girls of the IRL horses from earth. Only horse girl in this world, all isekai.
Human civilization has had horse girls since the dawn of time instead of horses. The only major historical change this seems to have caused is the existence of the Kingdom of Ireland. Horsegirls are literally the reincarnated spirits of horses. Highways have designated horsegirl lanes.