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've never seen demons
swarming around like this.
.لم أرَ شياطين يحتشدون معًا هكذا من قبل
So viele Teufel auf einmal hab ich
noch nie gesehen.
Nunca había visto que los demonios
formaran una manada tan grande.
Nunca he visto a tantos demonios juntos.
J’avais jamais vu des démons
se rassembler en meute.
Non ho mai visto così tanti demoni 
radunati nello stesso posto.
Eu nunca vi tantos demônios 
agrupados desse jeito.
Впервые вижу, чтоб демоны
роились, как насекомые.