for the first 5 years naruto was neglected for his brother and sister who are the jinjuriki's of the nine tails.
but one day when naruto is all alone walking along the streets of konoha he is captured by a man and turned into a slave at a slave training facility.
he is there for 11 years the only reason he left was because he broke out with 3 friends.
1 he knew from back when he was in konoha and the other 2 he meet in the hell hole he was taken to as a 5 year old.
they end up being captured again and turned into slave traders themselves but stick together no matter what.
they never wanted to be slave traders they were forced into the job or die so they had to take the job.
they remember nothing of their old villages...