Suzuki Iruma is too nice and just doesn’t know how to say no. One day, he somehow gets dragged into the netherworld where the demons live. He arrives at the great demon Sullivan’s mansion where he is asked to do the unthinkable... and ends up becoming Sullivan’s grandson! He is quickly enrolled into the Demon School Babyls where Sullivan serves as chair-demon. Iruma begins his super exciting school life at demon school while trying to conceal the fact that he’s a human!
Demon law dictates that the
 loser must serve the victor.
.ينصّ قانون الشياطين أنّ على الخاسر خدمة المنتصر
Der Verlierer beugt sich dem Gewinner.
Das ist bei uns Dämonen so. Und deswegen
De acuerdo a la ley demoníaca,
el perdedor sirve al vencedor.
De acuerdo a la ley demoníaca,
el perdedor sirve al vencedor.
Comme le stipule la loi des démons,
le vaincu jure allégeance au vainqueur.
La legge demoniaca prevede 
che il perdente serva il vincitore.
É a lei dos demônios, o
perdedor deve servir o vitorioso.
По правилам демонов проигравший
 становится слугой победителя.