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...
was the same as my body heat
when my mark supposedly appeared.
وتلك نفس درجة الحرارة الّتي شعرتُ
.بها أثناء وقت ظهور العلامة المزعوم
Esa era la misma fiebre que sentí
en el momento cuando me salió la marca.
y era el mismo calor que sentí
cuando tenía las marcas.
Il calore che ho provato allora
Era a mesma temperatura do meu 
corpo de quando a marca apareceu.
Когда появилась метка, жар ощущался
так же, как при болезни.