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.
was the realization of your desire
to make that frog black.
.هي تحقيق لرغبتك لجعل ذلك الضّفدع أسودًا
hat deine Begierde, ihn schwarz werden
zu lassen, materialisiert!
ton désir de noircir la grenouille
en réalité.
era proprio la proiezione del tuo desiderio 
di rendere la rana nera.
Era o seu desejo de fazer
aquele sapo preto ganhar vida.
ты захотел, чтобы лягушка стала чёрной,
вот она и обратилась!