The Hashira, Sanemi and Iguro, along with their comrades head to an abandoned castle on top of a mountain for a mission, while Tanjiro is being treated at the Butterfly Mansion for the wounds he suffered at the Swordsmith Village. Later on, the Hashira gather at the Ubuyashiki Mansion to hold a Hashira meeting, where Muichiro reveals how the marks manifested. In an effort to strengthen the entire Demon Slayer Corps from the bottom up, the Hashira Training begins...
I used the Thunder Breathing technique
you once taught me...
استعملت تقنية تنفّس البرق
...الّتي علّمتني إيّاها من قبل
da hab ich deinen Rat
mit der Donneratmung beherzigt
utilicé el secreto de la Respiración del
Relámpago que me enseñaste una vez
Gracias al truco de la respiración
de rayo que me enseñaste
j’ai repensé à ton explication
du souffle de la foudre
Ho preso spunto dalla Respirazione 
del Fulmine di cui mi avevi parlato
Eu usei a técnica da Respiração 
do Trovão que você me ensinou...
я воспользовался хитростью дыхания
молнии, о которой ты мне поведал,