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...
Living creatures pass on their memories, too.
.لكنّ المخلوقات الحيّة تورّث ذكرياتها أيضًا
Lebewesen erben auch Erinnerungen.
Los seres vivos también legan
memorias en los genes.
Los seres vivos
también heredan recuerdos.
mais également des souvenirs.
जीवित प्राणी
अपनी यादें भी विरासत में देते हैं।
Gli esseri viventi ereditano anche i ricordi.
Criaturas vivas também passam 
adiante suas memórias.
Живые существа наследуют память.