A spin-off from Assassination Classroom, in this world, Koro-Sensei is the Demon King while the students of class 3-E are cast as heroes who must defeat him. The students learn swordsmanship and sorcery at Kunugigaoka Magic School. Their strange adventure begins!

Jun Fukuyama
as Koro-Sensei

Mai Fuchigami
as Nagisa Shiota

Aya Suzaki
as Kaede Kayano

Ayaka Suwa
as Toka Yada

Chie Matsuura
as Megu Kataoka

Eiji Miyashita
as Sosuke Sugaya

Fuuko Saito
as Kirara Hazama

Hisako Kanemoto
as Hinano Kurahashi

Junji Majima
as Ryunosuke Chiba

Kana Ueda
as Yuzuki Fuwa