You are an exorcist apprentice, your duty is to exorcise the demons of the kingdom, only you are still a rookie and you have a long road ahead of you.

As an exorcist you needed a magical familiar to help you in the most difficult missions but due to a mistake in the summoning spell you ended up tying up one of the demon lords, Zeraphis.

And now even though he doesn't like it because of the contract he ends up helping you in almost all the missions because you are chased, scared or even cornered by low level demons before his eyes.