Due to very bizarre circumstances, the human boy, Suzuki Iruma, ends up in the netherworld. He is keeping the fact that he is human a secret and attends the Demon School Babyls. Because he is human, he cannot use magic so he had been using the Gluttonous Feeder Ring to get by in school. But then one day, the ring started to speak! Why, though? Iruma then meets the incarnation of the ring who calls themselves Alicred, AKA Ali-san.
I was talking with this ring, 
and we were practicing together!
!كنت أتحدّث مع هذا الخاتم، ونحن نتدرّب معًا
Ich spreche mit diesem Ring
und zusammen üben wir …
Stavo parlando con l'anello 
e stavamo facendo esercizi insieme!
Eu estava falando com este
anel e treinando juntos!
Я разговаривал с колечком
и вместе тренировался!