The Nilu kingdom had a tradition of selecting consorts for the king after he stayed for 35 years in the world. The tradition dictated that a king candidate should not marry until he was 35-year-old, then he had to send people to see young girls below 30 who were virgins.
For that, they had a device that was given by ancient cultivators to the royal family for their hospitality. They were actually the Hoshi and Kanakuba ancestors, the information got under the carpet of time.
The device could mark a virgin girl on her forehead, when the day of activation of the device comes, that girl would be teleported to the event area. There many such girls would be put under some test to select the consorts.
