Hell is under the supervision of the three controlling and cruel Demon Kings, until the day when a 3 year-old human named Maris appears. Should they execute him? Make him a slave? Or...raising him!? With all of Hell involved, the unthinkable child rearing starts.
Lucifer has inherited the title of Demon King passed down from his father. However, rather than fight the humans, he much rather just get along with them. Not only that, he becomes sick at the sight of blood. Since all the humans knew where the Demon King's castle was, he was constantly trying to be killed by assassins.
One day, the demon king announces that he has a son! Will the demons be able to raise this baby?
Bored of sitting around holding a wine glass all day, the Demon Lord is looking for something new. Something cute. Someone like Komomo, the level 0 heroine who has just appeared before him, ready to vanquish him like all heroes (or heroines) do.
After a long and treacherous journey, our Hero finally arrives at the Dark Lady's castle only to find himself being asked for help. The Hero explains how the war that the demons have brought upon the humans have killed thousands and put more in misery.