Yoriichi was the identical young dual off Kokushibo – Michikatsu in this situation as this is the name that Yoriichi know him as. Throughout their youth, Michikatsu usually checked Yoriichi since https://datingranking.net/es/salir-en-tus-30/ inferior incomparison to him. If twins have been produced, Yoriichi was ostracized out of their sister by grotesque draw he exercise, while Michikatsu try picked to be the successor of one’s family. The guy pitied Yoriichi for what the guy considered childish choices, stimulated on the from the just how Yoriichi manage stick to their mom. Not surprisingly, Michikatsu went out of his solution to talk to and you may work together together with his younger brother, even risking beatings from their dad which forbade interactions between your two. On a single occasion, Michikatsu snuck inside and provided Yoriichi a homemade flute. He informed him to expend in it if in case he was from inside the difficulties, saying that he’d been right away to guard their young cousin. 
Michikatsu is disrupted because of the their brother’s smile and you can unclear about their brother’s cherishing out of what he considered good “little bit of nonsense”
When Yoriichi try shown having a prodigious, sheer talent getting swordsmanship, the new brothers’ roles from inside the domestic was basically corrected. Michikatsu was not any longer considered new successor of one’s relatives, taking on his brother’s small, separated area when you’re Yoriichi grabbed his place due to the fact family members’ heir. It enjoy powered Michikatsu’s wish to grasp the methods of your blade and create stoke the newest brewing thoughts out of envy towards the his brother.
As he said his goodbyes, Yoriichi presented this new flute Michikatsu got given to him
When the mother died out of the blue, Yoriichi informed Michikatsu that he would be making household. The guy beamed, carrying they personal, informing Michikatsu it absolutely was precious which he thought of it as your. Immediately after training their mom’s journal, Michikatsu learned that Yoriichi was not clinging so you can their mom however, were support the lady, having understood about their disease weakened her. So it bottom line infuriates Michikatsu, an intense hatred and envy to your Yoriichi taking root within this your, to the point where he wants Yoriichi had not ever been born and you may mentally begs having your so you can die. 
So it hated merely grew when he is protected regarding a devil by the Yoriichi himself, who’d be more powerful. Immediately following abandoning his family unit members, the guy entered the fresh Devil Slayer Corps to fight close to their sis and get healthier. Michikatsu themselves attempted to understand Yoriichi’s Sunrays Breathing however, try not able in order to, rather using a good derivation one to turned also known as Moon Breathing. Michikatsu next transforms towards the a devil because of Muzan immediately following lamenting his inability so you’re able to previously meet or exceed Yoriichi inside fuel. 60 many years later on, both do meet for the past day. Michikatsu try threatened by Yoriichi’s mourning off their choice, but try nonetheless scared upon enjoying him prepared to attack. Whenever Yoriichi hit, Kokushibo is actually as well slow to react and you will are almost beheaded. Waiting around for the second hit, the guy understood Yoriichi got died regarding senior years and you may angrily reduce their system to the feeling of inferiority he achieved through the his lifestyle.
This might be heavily intended by tears destroyed from the your immediately after realizing that the latest flute he had talented his brother got stayed that have Yorichii anyway this time around. Therefore, Michikatsu couldn’t spend the this new flute following the latter’s death, and you may left they toward their individual for centuries thereafter until his or her own dying. At some point, in the finally times, he acknowledges their sis is actually past him in all suggests and you will questioned him to own as to the reasons he had been actually produced.