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...
If you slack off after one good day,
you'll end up right back where you started!
،إن تهاونت بعد أن مررت بيوم واحد جيّد
!فستعود لنقطة البداية ثانية
Wenn du nach einem guten Tag faulenzt,
war die harte Arbeit umsonst!
No te duermas en tus laureles
solo porque te salió bien una vez.
Si holgazaneas tras un logro,
volverás a empeorar.
Une seule réussite,
ce n’est pas suffisant.
अगर एक सफल दिन के बाद सुस्त हो गए,
Non puoi svignartela solo perché 
ci sei riuscito una volta, tornerai al punto di partenza!
Se enrolar por um dia, vai 
voltar para o começo!
А то быстро вернётесь к тому,
с чего начали!