There was a Demon Lord in the world. The King of the Kingdom of Athena, one of the two great nations, recruited heroes and ordered the subjugation of the Demon Lord.

Detecting the movements of the heroes' party, the Demon Lord was rather displeased.

"Despite governing my nation so earnestly, why must I be struck down? It makes no sense.

Moreover, the composition of the hero and his party raises questions. Why is the hero a Lieutenant Colonel of the Athena Royal Army? Why isn't their top general coming? And why are all of them, except for the hero, women? Is it a harem? —Ridiculous."

Therefore, the Demon Lord made a decision.

"When the hero arrives, I will absolutely make their lives miserable."

From the encounter between the hero, who set off triumphantly to subjugate the Demon Lord, and the Demon Lord, who grumbled incessantly while awaiting the hero, their destined love begins.