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 do what you can
so that it gets passed on.
عليك القيام بما تستطيع 
.لكي يُورّث للأجيال القادمة
Tienes que hacer un esfuerzo
para que continúe.
Esfuérzate para forjar una cadena.
Applique-toi
à transmettre ton savoir.
तुमसे जो बन पड़े तुम्हें करना होगा,
ताकि यह अगली पीढ़ी को मिले।
Você precisa fazer o possível 
para passar isso adiante.
Нужно стараться,
чтобы цепь не прервалась.