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...
Because making weapons
is all you're good for.
.لأنّ صناعة الأسلحة هو كلّ ما تجيدونه
Sie haben nur eine Fähigkeit,
und zwar Waffen zu bauen.
No tienen otra habilidad
más que fabricar armas.
Solo sabéis forjar armas.
Ils fabriquent des armes,
c’est tout.
क्योंकि तुम केवल
हथियार बनाने में ही माहिर हो।
L'unica cosa che sapete fare 
è forgiare le katana.
Porque fazer armas é tudo 
o que você sabe fazer.
У них один талант — ковать оружие.