The demon king Iblis was planning to rule the world, but he was defeated by a hero and weakened.
But after being defeated by a hero, he is weakened and transformed into a young girl.
The demon king secretly vows revenge.
She changes her name to Iris and sets out on a journey to regain her power.
But she is confronted by humans filled with lust and monsters who rebel against her.
Will Iris successfully defeat the heroes and take her revenge?