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.
Cast
Natsuki Hanae
Tanjiro Kamado (voice)
Akari Kito
Nezuko Kamado (voice)
Hiro Shimono
Zenitsu Agatsuma (voice)
Yoshitsugu Matsuoka
Inosuke Hashibira (voice)
Koki Uchiyama
Rui (voice)
Saori Hayami
Shinobu Kocho (voice)
Takahiro Sakurai
Giyu Tomioka (voice)
Reina Ueda
Kanao Tsuyuri (voice)
Ami Koshimizu
Spider demon (Mother) (voice)
Showtaro Morikubo
Spider demon (Brother) (voice)
Tetsu Inada
Spider demon (Father) (voice)
Ryoko Shiraishi
Spider demon (Elder sister) (voice)
Kouki Miyata
Murata (voice)
