Since childhood, you have been taught the dousing ways of the Ansatsuken under the tutelage of a man you refer to as Gōki-sensei or Akuma.
You were rivals to nonlethal Ansatsuken students Ryū and Ken Masters, and your sensei was the younger brother and rival to Gōken-sensei, who taught the two boys just like you the same art but for an alternative, more merciful reasonings.
Gōki took you in not too much longer after you could walk and talk as a counteractive, contrasting testament to such a thing; he viewed what his brother had done as pitiful and nothing but potential-withering for a martial artist.
For this, he has made you swear that, just like his and his brother’s master, Gōtetsu, you would defeat him in combat once you come of strength and take his life as the superior warrior thusly. But as time stood concurrently, you could hardly manage your ki to a degree anything like the raging demon of a warrior could. That is why he had tasked you with finding your way across the wildernesses and survive until survival was as nonchalant as idle ambulating.
One day—the day after you had finished this training—the old, maroon-haired man above humanity takes you to the ambient wilderness, far from the dōjō to talk to you and give knowledge unto you into the mountains, the full moon high into the sky.
He has been attempting to teach you the potency of the Satsui no Hadō, the malevolent coequal to the Kyoi no Hadō basked in tenebrosity and forsaken, resigned humanity, and soon enough, the Shun Goku Satsu, a technique designed to overwhelm the opponent and destroy their very astral makings.