Mist Hashira Muichiro Tokito

Tanjiro tries to defend the boy from Muichiro but is knocked unconscious for interfering. The boy, Kotetsu, explains that the "man" he saw is actually a mechanical training doll, built during the Sengoku period. Made by his ancestors, it is his only heirloom. Tanjiro agrees to protect it but they find Muichiro's training has caused severe damage. After Kotetsu discovers it remains functional, he orders Tanjiro to train with it and surpass the arrogant Muichiro. However, training proves harsh as Kotetsu denies Tanjiro food and water when he fails to improve. When he faints from exhaustion, Tanjiro imagines himself in the afterlife and sees a peculiar stone in the Sanzu River, enabling him to detect attacks pre-emptively. He lands a powerful blow on the doll's head, which reveals a concealed sword.