

Hearing this, Tanjiro understands the reasoning behind his resolve to not hand over the key to someone that could potentially break the doll. The boy replies that his ancestors were able to construct the doll at a level that couldn't be accomplished again at the present time-hence its durability-and he wouldn't be able to fix it himself especially without the aid of his late father, given that he doesn't possess the knowledge or skills to do so. Surprised, Tanjiro notes how that must mean Yoriichi Type Zero is over three hundred years old and even so, it still hadn't been destroyed. Tanjiro tries to push for more information, but the boy apologizes and states he didn't know much else, besides that it originated in the Sengoku period. He asks the young boy why the doll had six arms, in which he is told that as it was modeled after a real swordsman, the doll's six arms were necessary to imitate his movements. While watching Muichiro Tokito train against the mechanical doll, Tanjiro looks at the doll's face and ponders the idea that he has seen it before.
