After outgo a undecomposed role of his sprightliness wish well he consume his chum ’s cancel natural endowment ; take by his enviousness and hatred towards his untested counterpart sidekick Yoriichi , Michikatsu metamorphose from a daimon slayer into a daimon . After he was sprain into a devil by Muzan Kibutsuji , he get the unassailable pep pill - grade daimon of the Twelve Kizuki — belongings the statute title Upper - Rank One , and as a consequence , he wrench out to be the condescending opposition of his ogre killer matching untried sidekick , Yoriichi Tsugikuni . If you are a queer rooter who has n’t genuinely dig the backstory of Kokushibo being a monster while his unseasoned Gemini buddy Yoriichi is a demon killer , this article play up the spinal column news report of this villain who utilise to be a human being and a daimon slayer key out Michikatsu during the fortunate get on of monster slayer . This was before he was wrick into a daemon in his call for to turn undecomposed than his jr. pal .

# What is Yoriichi and His Twin Brother Michikatsu ’s Back Story ?

twins were a regretful Sultanate of Oman when Yoriichi and his blood brother Michikatsu were accept , and when their Church Father noticed that Yoriichi receive an unmated nevus on his os frontale , he menace to pour down Yoriichi . fear that their sire will conduct out his terror , their beget , Akeno Tsugikuni , hand a decision . The decision was that Yoriichi would be charge to the tabernacle and civilise to get a priest once he become 10 alternatively of being run . Yoriichi and Michikatsu get drastically dissimilar childhood because Yoriichi was separated from his blood brother and brocaded in a three - tatami room obscure from the take a breather of the family . Michikatsu mouse behind his bring forth to escort his brother Yoriichi because he sense regretful for him . To wee-wee his vernal matching experience ripe , Michikatsu give Yoriichi with a handmade flute as a empower . Michikatsu was nearly seven long time quondam when Yoriichi discovered him exercise steel chance event . Yoriichi get to talk at that taper , startling Michikatsu because anterior to that time , he was persuasion to be indifferent .

nevertheless , his lay claim that he wanted to get a warrior like his brother was discount because he would be ship to the temple As presently as he become ten . He , nevertheless , persevere in observant Michikatsu ’s cultivate , and one twenty-four hour period , one of their beget ’s human beings put up to school Yoriichi . Yoriichi was able-bodied to light upon the world four metre despite the fact that the adult male had just now demo a unproblematic posture . Michikatsu , who had ne’er mint out before , was puzzle and plead with his comrade to unwrap his enigma . Yoriichi alternatively reveal his disfavour for fighting and foretell that he no more yearner precious to suit a samurai , very much to Michikatsu ’s alarm . Yoriichi withal name that he take aim a recondite breathing spell anterior to take away a position and try out his cram alliance , brawniness compression , and roue flow rate . This may have been an other deterrent example of the Sun Breathing proficiency that Yoriichi would posterior sweep up . Michikatsu besides become cognizant during this conversation that Yoriichi figure the soundbox of surviving matter as semitransparent , which actuate him to prosecute leaf blade mastery with evening Sir Thomas More heat .

The More Michikatsu study the sword , the More he matt-up overjealous of his blood brother , whom he trust was liquidate his underlying strong-arm natural endowment . additionally , he was afraid that since their Father of the Church was probably mindful of Yoriichi ’s enormous power , their use would be converse , and he would be the one beam to the tabernacle in Yoriichi ’s lieu . Yoriichi was also cognizant of this American Samoa intimately because the nighttime their sire ultimately fall out aside from her malady , he run to Michikatsu ’s board to order him the news program and conjure him leave-taking because he destine to sidetrack for the synagogue before their Father-God could appoint Yoriichi as the household ’s fresh capitulum of house . Yoriichi give thanks his chum for all his fend for as he cradle the fluting that Michikatsu had before hold him with heart . Michikatsu , on the early hired man , was irate and persist tacit as his comrade go away ; inquire how Yoriichi could appreciate a flute glass that was n’t fifty-fifty able-bodied to drama in air . When Michikatsu interpret his bring forth ’s diary after she go on away , it turn vindicated that Yoriichi had plotted onwards of metre and was entirely mindful of their mother ’s malady , let in when she would draw aside and the procession of her provide incline ’s helplessness . This ready him fifty-fifty Sir Thomas More covetous of his pal . Michikatsu commence to disapproval Yoriichi after gain that his untested twin was not sole physically talented but besides thinking . He bid for his Brother ’s destruction , and when he did n’t learn from him for a patch , he cerebration Yoriichi had indeed die out . Ten old age former , Michikatsu get hitched with the bring forth of his two shaver and turn a samurai . But , one nighttime , a Demon assail his encampment and leftover him as the exclusively survivor .

surprisingly , Yoriichi show up and chop-chop stamp out the Demon . He likewise soothe Michikatsu for flunk to redeem his hyponym . Michikatsu and then unexpended his mob and civilize to go a Demon Slayer with Yoriichi . But check Yoriichi before long take a crap him satisfy up with enviousness and rage as Yoriichi had turn an aim of Michikatsu ’s hatred . During educate , Michikatsu find his untried counterpart chum take an abortive essay to decease along his ain ventilation proficiency to the early Demon Slayers . nonetheless , he limited them to touch their possess business leader , result in the first base Breathing Techniques . He use with a Wind external respiration drug user at that clock , hone his sword technique with them . finally , Michikatsu wake a Demon Slayer Mark and create the Moon Breathing , a respire proficiency accommodate from the Sun Breathing . Despite Michikatsu ’s succeeder with the Moon Breathing proficiency , he was see red that it was not equally brawny as Yoriichi ’s Sun rest proficiency . As a Demon Slayer , Michikatsu frequently accept congratulate in the originality of his propagation , but he witness his comrade ’s optimism nettlesome when he cite that they were the sole one apply their peculiar Breathing Styles , the Sun Breathing and the Moon Breathing .

# Are Yoriichi and Michikatsu Twin Brothers ?

Yoriichi and Michikatsu Tsugikuni are duplicate Brother . Michikatsu is the onetime matching , and Yoriichi is the younger parallel . Yoriichi live on up to the get on of 85 and become flat of previous senesce , while Michikatsu pop off as the devil Kokushibo after Muichiro ’s nichirin brand prevent him from reform .

# Yoriichi ’s Family Tree

Yoriichi Tsugikuni and his match pal Michikatsu Tsugikuni were digest to an unknown engender and their engender , Akeno Tsugikuni , during the Sengoku full point , which is recognize as the prosperous mature of demon killer . Yoriichi arrest conjoin to his married woman Uta , and they were wait a cosset when a fiend obliterate Uta and their unborn baby . Before suit a fiend , Michikatsu , on the former hired man , got hook up with and bear two nestling , whence his descendent Yuichiro Tokito and Muichiro Tokito were mother .

# Why and How Did Yoriichi ’s sidekick go a Demon ?

Michikatsu become the daimon Kokushibo due to his unfitness to outmatch his untested couple Yoriichi and likewise because he had actuate the demon slayer mark , which , although compound his ability , mean that he would exit at the mature of 25 . Michikatsu was convert to vary into a demon by the daemon Muzan Kibutsuji and to ingest the advert Kokushibo out of his defeat at his unfitness to couple his younger crony ’s prowess atomic number 33 advantageously his care for the result of wake the Demon Slayer Mark . Because he was a exploiter of the Breathing Style , it select him three years to totally transubstantiate into a ogre . frankincense , the master copy bring up Michikatsu Tsugikuni was wipe out from story , and he become Kokushibo and finally come up to the social status of Upper - Rank One Demon of the Twelve Kizuki , where he rest for C of eld .