After Nathan arrived at the organization and was undergoing training, unlike Aroma who wasn't only about fighting but pursuing her father's steps, which turn to passion as she loves it, Nathan had to remain at the camp.
They were given proper education just like any normal kids until they grow into their teens. They don't have much to do, as the elders were still in charge.
They were just like a build up, so the legacy wouldn't go to ruin. Nathan was favoured by the former leader, while Aroma will be who she is now, whether she's favoured or not, because it's like the fate created for her before birth.
She was opportuned to freedom after graduating from school. The school where she met her two best friends, whom they were all in the same department.