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...
It isn't just your physical form
that gets passed on.
.لا يرث المرء الخصائص الجسديّة فحسب
Was man vererbt bekommt,
ist nicht nur die äußere Erscheinung.
No se heredan solo
las características o la apariencia.
Les êtres vivants
héritent de l’apparence,
केवल भौतिक रूप ही
विरासत में नहीं मिलती है।
Ciò che ci viene tramandato
 non è solo l'aspetto o la forma.
Não é só a forma física 
que é passada adiante.
Потомкам передаётся не только
внешнее сходство.