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...
Having such a simple mind
that you can call this simple...
إنّ امتلاك عقل بسيط يجعلك
...تصف ما حدث بالبسيط أيضًا
Ich beneide simple Gemüter,
die so etwas als simpel erachten.
Envidio esa cabeza simple tuya
que piensa que eso es fácil.
Envidio tu simpleza
si consideras algo así "fácil".
Il faut être simple d’esprit
pour trouver ça simple.
Invidio i faciloni che pensano 
che una cosa simile sia "poco".
Ter uma mente tão simplista para 
dizer que isso é simples...
Могу только позавидовать душевной простоте
человека, не видящего здесь сложности.