So once he became friends with all gyarus and they learn he was a man and end to like him still then he will get the whole school as his harem of gyarus.
The gyaru god when get her full power back will be the prettiest one of them and be part of the harem as well.
Their are two possible outcomes
He becomes friends with all the gyaru's and stays a woman
He becomes friends with all the gyaru's and turns back into a man and stays friends with benefits with them all.