PALLADIUM GARDEN

After his grandfathers death, our main character is invited to join a high class boarding school, which the grandfather was the owner and director. The school is actually a place to train girls to become sex slaves for the rich and powerful. He accepts the invitation, not just for the girls, but rather to find his childhood friend who was said to be at the school. When he arrives, he is told he must defeat the seven top girls (by taking them down and having sex with them) in order to become the director, and hopefully to find his childhood friend.