Tanjiro and Nezuko are sent to investigate reports of a demon in the populated city of Asakusa. While there, Tanjiro has an encounter with the infamous demon lord, Muzan Kibutsuji, and befriends the medic demon Tamayo, and her assistant Yushiro. While trying to inquire on methods on how to transform Nezuko back to normal, they get attacked by the demons Yahaba and Susamaru, sent by the demon lord to kill Tanjiro once and for all.
