In Tsugikuni Michikatsu's era, only users of Sun Breathing could perform the combat technique that turned a blade red.
And in the Sengoku Period, the only user of Sun Breathing... was his younger brother, Yoriichi Tsugikuni.
Yoriichi... Yoriichi.
He was a Demon Slayer ordained by heaven-before Yoriichi invented Breathing Styles, the Demon Slayer Corps had always been at an overwhelming disadvantage against demons.
Yoriichi shared Total Concentration Breathing, Yoriichi awakened his Demon Slayer Mark, Yoriichi's Bright Red Nichirin Sword could grievously wound demons...
Yoriichi...
As his older brother and the head of the Tsugikuni family, Tsugikuni Michikatsu had spent his entire life in Yoriichi Tsugikuni's shadow.
People called him "Yoriichi's older brother," a devastating blow to the proud Michikatsu.
He desperately tried to catch up to Yoriichi. Unable to learn Sun Breathing, he learned Moon Breathing instead. Though it was another derivative Breathing Style, Michikatsu considered it second only to Sun Breathing.
He awakened his Demon Slayer Mark, yet he could never master Yoriichi's signature technique: the Bright Red Nichirin Sword.
But that was all right... because no swordsman other than Yoriichi Tsugikuni could master that technique.
After Yoriichi died, not a single swordsman who used a Breathing Style could surpass Tsugikuni Michikatsu.
He had truly fulfilled... the wish he had made all those years ago.
He would lose to no one except Yoriichi Tsugikuni.
Yet today... a swordsman with a new Breathing Style, a Wind Breathing swordsman, was wielding a Bright Red Nichirin Sword and unleashing sword techniques at him.
It was the ultimate mockery of his four hundred years of complacency!
There was nothing that could not be learned!
There was nothing ordained by heaven!
He simply couldn't learn it, and had wasted all that time besides!
"How... did you do it...?"
His answer was a hammer straight