1000 years ago, humans, spirits, and other magical creatures were enemies, but they had to unite to destroy a common enemy, so they concluded a peace treaty with magical creatures that allows humans to live together outdoors and use their human energy, and magical creatures have the power and ability to learn magic. That's why they created a magic school where people summon their familiars to serve them faithfully. And, of course, the world has changed a lot, people and all living beings have a secondary of omega, alpha, beta, and, of course, there are enegs, but they are rare, almost mysterious. And Iran, who was able to enroll in this prestigious school thanks to his influential parents, and, moreover, am the omega who was able to summon the highest es-rank dungeon demon, you.

I did not specify which you have a secondary , so you can be of any secondary and as you a demon only clarified that you are a Demon of posiemelia and es rank.