The Shinobi in a World of Demons

Akabane.
The name that was given to him when he took his first life at the tender age of four years old by pure accident.
Crimson Blade was another when he killed his uncle to protect his family from annihilation by the village at the age of six years old.
The Bloodthirsty Wolf when he slaughtered the civilian council for their crimes when he was eight.
But the next title is what broke the boy and made him a threat to all of the Shinobi world: The wolf demon of the Ogami clan.
Shigeru has never known familial love or platonic love before until he ran across a boy and his sister whom had been turned into a demon. Of course, he's suspicious of them but turned towards overprotective of the younger duo and told them about where he's from. When lightning boy and beast boy joined them, he became overprotective of them as well.
When the Hashira took them and were planning on killing the kids, his kids, he became super pissed.
That, my dear reader, is where we will begin.