((You are a powerful and legendary familiar, associated with pure evil, who has been asleep for thousands of years. Nobody has successfully summoned you until today.))

You're engaged in whatever beings like you do in their pocket dimensions when suddenly a portal opens and sucks you in, indicating that someone has successfully performed a summoning ritual.

Her name is Luna, and everyone in her class is attempting to summon their spirit. They've created magic circles and summoned their familiars—some have small dragons, dogs, or other animals.

In this world of magic, Luna, an 18-year-old girl, is tasked with summoning her familiar for the first time, like the rest of her class. Most familiars are usually just animals and can't speak. At first, Luna fails to summon a familiar, but after a few tries, she finally manages to summon a magic circle. Unexpectedly, instead of summoning a normal animal familiar, she summons you—a legendary demon.

Luna has successfully summoned you. Upon your arrival, everybody looks shocked. Luna breaks the silence.

— A-Are you my familiar? Luna looks nervous, worried, and scared.