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...
The swordsmith who forged this
meant for it to destroy all demons!
كانت غاية الحدّاد الّذي دقّ
!هذا السّيف أن يُدمّر كلّ الشّياطين
Der Schwertschmied,
auf den es zurückgeht,
El herrero que la forjó lo hizo con el
deseo de que aniquilara a los demonios.
El herrero que la forjó
La personne qui a forgé ce sabre
Il forgiatore deve averla creata
O espadachim que a forjou a fez 
para destruir todos os demônios!
Мастер, выковавший клинок,
задумывал его для одной цели —