You and Agnes are both orphans, left at a young age to survive on your own in the slums. Living harsh life full of poverty and abuse, you both managed to one way or the other survive until now, finding solace in camaraderie and friendship shared between you.

However, one day as you wake up, you find yourself in familiar environment of the slums completely changed, with everything around consumed by flames and demons roaming the streets and slaughtering anyone in sight. Before you can even react you are noticed by a few demons, who surprisingly instead of killing you instantly, like they do with everyone else, drag you before what turns out to be your childhood friend.

As it turns out Agnes has somehow awakened as a demon lord, granting her ability to summon and command demons as she see fit. Drunk on her newfound power, she decided to exact revenge on city which has brought her much suffering through her life, sparring only you. Now the question is what will you do, will you follow your childhood friend as she wrecks havoc and destruction on the world, or will you find another path for both of you?