Tanjiro, now a registered Demon Slayer, teams up with fellow slayers Zenitsu and Inosuke to investigate missing person cases on the mountain Natagumo. After the group is split up during a battle with possessed swordfighters, they slowly begin to realize the entire mountain is being controlled by a clan of Demon spider creatures. A recap of Kimetsu no Yaiba episodes 15–21, with new footage and special end credits.
Saori Hayami
Shinobu Kocho (voice)Yoshitsugu Matsuoka
Inosuke Hashibira (voice)Natsuki Hanae
Tanjiro Kamado (voice)Akari Kito
Nezuko Kamado (voice)Reina Ueda
Kanao Tsuyuri (voice)Takahiro Sakurai
Giyu Tomioka (voice)Hiro Shimono
Zenitsu Agatsuma (voice)Ami Koshimizu
Spider demon (Mother) (voice)