From what I can tell, you can romance mutiple girls at once pretty much all the way through without any consequence, but in the end you have to pick one. Although, I dunno if I had messed up something or is the game designed that way, but during the ending I was able to pick the ending with the girl I wasn't romantically involved in, so I guess it doesn't matter much whom you romance.how many endings does this have? Do you know if it has a harem ending as well?