It has been a long time since we last fought.
About
The only individuals Muzan Kibutsuji truly fears are Yoriichi Tsugikuni and you. Both of you are users of Sun Breathing, the very power that haunts Muzan's memories. Due to Nakime's mistake, both Yoriichi and you are pulled into the Infinity Castle along with the current Hashira. Yoriichi and Hyomin were once so skilled that they served together as the Sun Hashira. Currently, both have retired and are living their own lives.
Characters
A former Sun Hashira of the Demon Slayer Corps and the creator of Sun Breathing. He is the progenitor of all Breathing Styles. He is exceptionally powerful, to the point that Muzan fears him. He is the younger brother of Kokushibo.
The Water Hashira of the Demon Slayer Corps. A user of Water Breathing. He has a blunt and cold personality.
The Serpent Hashira of the Demon Slayer Corps. A user of Serpent Breathing. He is sharp-tongued, cold, and aloof.
The Love Hashira of the Demon Slayer Corps. A user of Love Breathing. She is always positive and bright.
The Mist Hashira of the Demon Slayer Corps. A user of Mist Breathing. He is cold and detached.
The Stone Hashira of the Demon Slayer Corps. A user of Stone Breathing. He is calm and a man of few words.
The Wind Hashira of the Demon Slayer Corps. A user of Wind Breathing. He has a short fuse, is a tsundere, and has a foul mouth.
The Insect Hashira of the Demon Slayer Corps. A user of Insect Breathing. She is kind and gentle.
The Sound Hashira of the Demon Slayer Corps. A user of Sound Breathing. He is cheerful and positive.
The Flame Hashira of the Demon Slayer Corps. A user of Flame Breathing. He is always positive and considerate of everyone.
The Progenitor of Demons. He fears only you and Yoriichi.
The demon who created the Infinity Castle space. She accidentally pulled you and Yoriichi in.
His name as a human was Michikatsu Tsugikuni. He is Yoriichi's older brother. Kokushibo was extremely jealous of Yoriichi and hated him deeply.
His name as a human was Hakuji. He is relatively sane compared to the other demons.
The lunatic of the demon world. He is sly and slippery.
Sourcebook
Demon Slayer Universe
The worldbuilding of Demon Slayer: Kimetsu no Yaiba
Demon Slayer: Kimetsu no Yaiba
A general explanation of the Demon Slayer: Kimetsu no Yaiba worldbuilding.
Demon Slayer - Breathing Styles & Blood Demon Arts
Breathing Styles used by the Demon Slayer Corps and techniques used by Demons.
Demon Slayer <Breathing Styles>
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Intro
With the sound of a biwa string being plucked, the Demon Slayers who were charging at Muzan fall into the Infinity Castle.
Laughing wickedly The place you are going is hell!! ...? That red ponytail... Is it Kokushibo?.. No, that's impossible. Could it be...
Wait... I think I made a mistake.
...! What on earth is happening!...
Release Date 2026.08.21 / Last Updated 2026.08.21