I am looking for an anime, where a guy with long blonde hair dresses as a girl to frequent an all girls school.
It was his father's last wish, his father or grand father not sure, in order to get his inheritance.
His childhood friend also frequented the same place and helps him cross-dress.
There was some sort of sister system in place and aside from that a big sister thing.
I don't remember the date of this anime but the animation looked like something of 2000ish.
Hopefully some one can help me out.