Tanjiro Kamado, a boy whose family was killed by a demon, joins the Demon Slayer Corps to turn his younger sister Nezuko back into a human after she was transformed into a demon. After destroying his sword, Tanjiro journeys to a village of swordsmiths and has to explain how his sword was so badly damaged to Hotaru Haganezuka, the smith who made it. While Tanjiro waits for his sword to be repaired, enemies close in. The Mist Hashira, Muichiro Tokito, engages the demons, but he needs some help from Tanjiro and Genya, another Demon Slayer, as they face this foe that can split itself into four separate bodies and regenerate almost instantly.