Why must the devil be Defeated?

Summoned by the Goddess to vanquish the Devil threatening world peace, a warrior accepts his destined mission without question—until he discovers the truth. Armed with determination and a mysterious book, he embarks on an epic journey to save humanity, only to find himself ensnared in an elaborate deception. In this alternate universe tale of fantasy and folly, nothing is as it seems. As the warrior draws closer to his ultimate confrontation with the Devil, reality unravels around him, revealing that his greatest enemy may not be the one he was sent to defeat. A comedic adventure of epic proportions, where destiny becomes delusion and heroism transforms into heartbreak. Perfect for fans of harem tales with unexpected twists.