Tanjiro encounters Mist Hashira Muichiro Tokito and Kotetsu, a boy from the village, arguing. Muichiro is demanding that a "certain key" be handed over to him from Kotetsu. Being unable to look on in silence, Tanjiro intervenes to speak on behalf of Kotetsu, however Muichiro refuses to listen. According to Kotetsu, the key is used to operate a battle-type Mechanical Doll, Yoriichi Type Zero, that mimics the movement of a certain real-life swordsman...
You have to try hard now
for your future self...
عليك بذل قصارى جهدك من أجل 
...نفسك في المستقبلك
Denk daran, was du in 10, 20 Jahren können wirst!
Dafür musst du jetzt an dir arbeiten!
Lo que te esfuerces ahora te servirá
en el futuro, en 10 o 20 años.
Esfuérzate por el Kotetsu
de dentro de 10 y 20 años.
C’est maintenant que tu dois t’entraîner
pour dans 20 ans.
अब तुम्हें अपने दस,
बीस साल बाद वाले भविष्य के लिए…
Devi impegnarti adesso
Para seu futuro daqui a 15, 20 anos...
Стараться нужно и ради того, кем ты будешь
через десять или двадцать лет!