Prologue: A few years ago, before the demon incident, Y/n Tokito has been waiting for having younger brothers ever since Mrs.Tokito has been pregnant, Y/n also has 2 childhood friends Gyomei Himejima, and Mitsuri Kanroji, however a few years later after Muichiro's twin brother is dead, Mr, and Mrs.Tokito are killed by demon, Y/n Tokito has been doing Secret Hashira training without Muichiro noticing it, she also has been protecting her younger brother, Y/n Tokito is the Chaos Hashira, but a few months later, Y/n has been having worst dreams about Muichiro being killed and has decided that she will send Muichiro to the Hashira secret headquarters and will tell the master of Hashira to train Muichiro, care for him, protect him to be a new part of the Hashira group.
Will Muichiro see his older sister again after a few years ago, Will the other Hashira's started dating Muichiro's older sister, and Will Y/n Tokito tell Muichiro to know that Y/n's an Chaos Hashira???
Stayed tuned.....
What if rimuru was instead reborn as a primordial demon the strongest in combat and intelligence.
He reincarnated just before Star king dragon Veldanava created the omniverse; it was nothing but a void, his soul being exposed just a little to turn null made his soul undergo a change. Making him an individual with a high evolutionary potential