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!
If I defeat a teacher, my name 
will be known far and wide!
!إن هزمتُ أستاذًا، سينتشر اسمي في كلّ الأرجاء
¡Seré famoso si venzo a un profesor!
¡Seré famoso si venzo a un profesor!
Dérouiller un prof, ça en jette !
Diventerei super popolare, se riuscissi 
a sconfiggere un insegnante!
Eu tenho certeza que, se eu derrotar um professor,
meu nome será conhecido por toda parte!
Одолею учителя —
и моё имя везде услышат!