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...
His actual face
is such a dead ringer for his mask
إنّ وجهه الحقيقيّ يشبه تمامًا قناعه
Sein Gesicht soll seiner Maske
zum Verwechseln ähnlich sehen,
tiene una cara muy similar
al rostro de la máscara,
उसका असली चेहरा
उसके मुखौटे से इतना मेल खाता है
Sotto la maschera ha un viso 
che ricorda quello della maschera,
O rosto dele é tão parecido com a máscara