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...
At this rate,
my temperature's never gonna go up!
!على هذا المعدّل، لن ترتفع حرارتي أبدًا
Wenn das so weitergeht,
dann wird meine Temperatur ja nie steigen!
¡Así nunca se elevará
mi temperatura corporal!
Así no subirá mi temperatura.
¡Estáis muy tibios!
C’est pas comme ça
que ma température augmentera !
Di questo passo...
Nesse ritmo, minha 
temperatura não vai subir!
От такой ерунды
температура не подскочит!
ของแค่นี้...