After naruto died in an accidental fall from a mountain at the age of 5 was then later reincarnated to the demon realm born from a demon mother until he turned 12 his mother was killed in a cross fire until the boy came to a mindset of nothingness
Naruto was resting in his bed, because ever since he was working with his brother on this traitorous group. He would normally capture the one's involved and purged them if they don't co- operate and tell him what he needs, but then he starts seeing visions. About a young boy wearing a orange jump suit with some blue orb in his hand, then Naruto shot out off bed as he noticed swirling sounds as he looks at his right hand and he sees an orb from the same vision he saw this
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"What is this?" Naruto asked himself not knowing how he manifested this orb.
Without examining it his teacher came through the door way.
"Young master?"
"What do you want?" Naruto asked
"The demon king has adopted a demon child" She said as she left him be without even seeing his surprised expression
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Naruto entered the throne room meeting up with his father and beside him was a silver haired boy who is about 12 in human years and a mark on his forehead
My son this is important of what I'm about to tell you
Naruto just looked at him with a poker face waiting for him to say something
This boy besides me is the son of the high ranking demon, but thanks to those traitors you and meliodas are working on he doesn't have parent's. So I ordered your teacher to bring him her.
"I see, but it's unnatural for him to have a mark like me and meliodas, so I guess you did give him some power." Naruto assumed not taking an eye of his adopted brother.
No I didn't, his father is powerful, surpassing the 6 Knights of black
"I see"
Look out for him, he may be a use in the new future.
Naruto nodded as he walked towards his adopted brother.
The silver haired boy was nervous meeting the prince of the demon race.... No his older brother, but he tried his best to hide it.
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Naruto gently ruffled his hair as he nelt down reaching his level.
"What's your name kid?" Naruto asked with slight zero emotion
"I-I-im Estarossa..." He stuttered
"Well Estarossa from now on you are part of this family and hopefully you won't disappoint me" Naruto said as his adopted brother nods nervously
"Alright from tomorrow we need to shapen up and it seems you know some skills in fighting so training you won't be a bit challenging just like it was since I trained your older brother."
"Oh ok" Estarossa replied
Before the two siblings were to leave the demon king spoke.
While you train that boy Naruto I need to investigate on missing demon that were cast out of the demon realm.
"Sure thing father, I won't let you down" Naruto replied
