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...
this one, being in such a remote area,
must've been abandoned and forgotten.
فإنّ هذه القلعة الّتي كانت في منطقة
.بعيدة، قد تمّ التّخلّي عنها ونسيانها
weil sie nach der Meiji-Restauration
nicht mehr gebraucht wurde
el castillo quedó abandonado
y olvidado al estar en un lugar remoto.
qu’il a échappé à la destruction
pendant la Restauration,
è stato completamente dimenticato
como ele ficava em um local remoto, 
foi abandonado e esquecido.
พอดีที่นี่ห่างไกลความเจริญก็เลยถูกทิ้งลืม