Ordinary high school student Usato is mistakenly suddenly summoned to another world along with his classmates and student council members Suzune and Kazuki.
A-A demon lord?!
!مـ-ملك شياطين؟
E-Ein Dämonenkönig?
¡¿Un señor demonio?!
¡¿Un señor demonio?!
Un signore dei Demoni?!
U-Um Lorde Demônio?!
Князь тьмы!