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...
so everything you learn
during Hashira Training...
لذلك فإنّ كلّ ما ستتعلّمه خلال
...تدريب الهاشيرا
Daher glaube ich, dass alles,
was wir im Säulentraining lernen,
Las enseñanzas del entrenamiento de los
Pilares nos llevará a un futuro mejor.
Seguro que lo que aprendas entrenando
alors ce que tu apprendras
des piliers
Ciò che imparerai 
nell'allenamento dei Pilastri
Por isso, tudo que aprender 
no Treinamento Hashira...
Так что всё, чему ты научишься у столпов,
наверняка приблизит светлое будущее.