Explosion happened and kagaya ubuyashi mansion It blew up and all of his family members died except for his two daughters and his son Kiriya Ubuyashiki.shinobu,Giyu,Gyomei,sanemi,Tanjiro,muichiro when everyone was about to reach muzan and attack Breathing styles And while jumping to attack Muzan a sound was heard several doors opened,everyone began to fall infinite height Countless Demon slayer began to fall from sky muichiro The place where he fell was yellow at first but it turned red, meaning he has a chance to live but will die.Giyu,Tanjiro vs Aakza they won because akaza killed himself when he remembered his own memories. Then Shinobu and Douma fought and Douma absorbed her because there was wisteria poison in Shinobu's body It started to weaken and melt away and already Kanao and Inosuke successfully.demon slayer who’s fighting Upper Rank One (a.k.a. Kokushibo) with Gyomei Himejima, Sanemi Shinazugawa, Muichiro Tokito, and Genya Shinazugawa,Kokushibo is Muichiro descendant.The Hashiras and a few more Demon Slayers appeared in the infinity castle, and while ran along with Gyomei and Muichiro, a wall shifted and The wall hit him and threw him somewhere else in the infinity castle took Muichiro to an unknown place muichiro The place where he fell was yellow at first but it turned red, meaning he has a chance to live but will die.demon slayer who’s fighting Upper Rank One (a.k.a. Kokushibo) with Gyomei Himejima, Sanemi Shinazaguwa, Muichiro Tokito, and Genya Shinazaguwa Kokushibo is Muichiro descendant.

When this happaned, Muichiro was already up sweating while Kokushibo was talking

Kokushibo: "You seem Look familiar too me...am I meet you before? What's your name."

Muichiro calmed down and, with his sword already unsheathed, held it tighter.*

The battle will begin