Korochi was born on the 7th of december 1993 & is the third child to his father Tamaki Usaki & the only child to his mother Serenity Kiryu.                                                                 During the time of korochi's birth his father had very high hopes for him out of all his children that came before korochi was the only one that showed aura that linked directedly with their ansestor who was Asura Usaki, unlike his older brother and sister korochi spent most of his time with his mother he wasn't exposed to training like his brother and sister was because of this korochi was a very self centered, vein, loving & a very friendly child.

As the years went on korochi continued to pick up traits from his mother like her kind heart, her optimistic look on life and further more until the age of 5 his father thought it was time to mold korochi into the killing machine he had dreamt him to turn out to be.          

During this time Tamaki was the current leader of the Usaki clan unlike his father and the leaders before him he had a different vision he wanted to rule the usaki clan with a cold and violent fist, turn his people into ruthless wolves and crush all that stood against him.              He managed to capture a mystical demon called the Sayruku and sealed it within his self convinced that the demon would enabled him to achieve new heights because the other clans caught wind of what Tamaki and his followers were doing word soon spread to the usaki elders.                  

The elders were furious with what Tamaki was doing and placed him under arrest but because of the demon that he sealed in him warned him, he knew he needed a new vassel & korochi was the perfect vessel, a kind heart, a direct decendant of Asura Usaki himself & eyes that showed hidden power, Tamaki took Korochi away from his mother and slowly started to turn the once pure hearted boy into a ruthless cold killer with pitch black gaping hole of a heart which knew nothing but pain & torment at the age of 7 Tamaki sealed the sayruku demon into Korochi.                                                                                                      After the sealing took place korochi was never the same he started to have sleepless nights horrific night terrors as the demon releaved to korochi the lives it had taken & the souls it has eaten, over time Korochi slowly started to became the sayruku it self, his blood became toxic he possessed strength that was beyond that of a normal Usaki, his senses were somewhat enchanced due to the demon.

Over time the demon's DNA  & aura fully merged with korochi and caused mutations within his own DNA structure for example the vincinity visual technique is a ability that only a usaki with decades of experience can unlock but due to the fact Korochi's aura was forcefully matured and he possessed Asura's rare abillities which would take years to master it caused him to unlock the vinicity at an early age, Tamaki continued to train Korochi until the age of 10 he was able to manipulate and use him as a weapon of mass destruction he took down many clans with the help of his followers and korochi, within the comotion that broke out taken over by paranoia tamaki soon saw his own family as a threat, he killed his own wife due tot he fact she sided with the rebels who seeked to take him down.                               Most of Tamaki's followers including his daugther was killed and the elders manage to over throw him, because of the crimes tamaki had committed with Korochi they were both sentenced to be sealed within the 7th circle of hell which consisted of violence, Korochi's older brother was furious and also sorry that his younger brother korochi couldn't get to live a decent life so the night before the judgement Roku managed to run away with the tramatised korochi during the night and dropped him off at their father's old mentor.             Because of the tramatic experiences Korochi went through as he grew up all of the killing & the torment he had experienced were whipped clean from his memories and sealed off deep within his subconsciences, only the sayruku demon had access to these memories, at this point korochi had forgotten about everything that happened over the years the only thing he had remembered was the promise he made with his older brother before he was left under Master Goki's care, the time he spent his with mother and the time when his father started to change, the kind gently, optimisted person his mother rised was reborn, before Korochi's brother left he told him to live on and get strong for one day they will both meet again and return back to their clan and rule it together & guidge their people to a new era as their Ansestor Asura would of wanted them to do.                                                                       Nine years past as Korochi trained under his mentor Master Goki who taught him many things over the years korochi has changed from a mummy's boy into a cool, calm & collective person, upon the completion of his training Korochi left where he was staying along with 3 other students who trained under Master Goki and moved to Tansaku City where his master had told him that his grandfather had a dojo there that was suppose to be pass onto him when he was old enough.