If anyone in the world understood Sun Breathing best...
Then.
It was not Tanjuro, who relied on the Kamado family passing it down generation after generation.
Nor was it Shinjuro, whose family's ancient texts gave him only a partial understanding.
Much less Muzan-boy, who had personally tasted the blade and been left psychologically scarred.
It was not even Xia Xi-boy, who had watched from afar for a while through a CG.
The one who truly understood Yoriichi best, and who understood and studied Sun Breathing and its derivative swordsmanship most deeply...
Was Michikatsu.
He had spent his whole life wanting to learn Sun Breathing, desperately chasing Yoriichi and hoping to surpass him.
Then, after accepting reality.
Michikatsu Tsugikuni had sought to obscure the vast [blazing sun] with the light of [moon radiance].
He was the one who, over these five hundred years, understood Sun Breathing best apart from the Red Heavenly Venerable himself.
Every detail of each breath.
Every technique of each swing.
He remembered them clearly... they were even etched into his bones.
"Matsushita, just where... did you learn Sun Breathing?!"
There was an unmistakably accusatory edge to his voice.
[Moon Breathing]
[Third Form: Loathing Moon: Erosion]
Two enormous storms of blades erupted from the ground, each over ten meters tall, nearly the height of a three-story building.
They were even more violent than his earlier ordinary slashes.
The tiny, spinning crescent moons they produced were also denser by far.
Faced with Kokushibo's interrogation, now clearly charged with emotion, Xia Xi had no time to answer at all.
Because he had already begun going all out.
[Dawn Breathing: True Total Concentration!]
[Second Form: Moon Radiance: Rising with the Tide]
The Great Tachi in his hands whistled as he swung it.
An equally vast and cold tide composed of moonlight.