In He Who Vowed to Create a Demon Harem, a hero finds himself in an unexpected predicament-falling for the demons he was sent to destroy. Set in 1887, humanity is under siege by demonic invaders, and only the brave warriors known as heroes stand against them. Theo, one such hero, is determined to reclaim the city of Manc from the powerful Halfas family. But things take an unexpected turn when he encounters the family’s daughters, far more captivating than ever imagined.
Thrown together by fate, Theo and three demon girls embark on an epic journey filled with danger, unexpected alliances, and undeniable attraction. Though they start at odds, a mysterious artifact soon helps bridge the gap between them in interesting ways. Will Theo fulfill his mission, or will he succumb to the charms of his former enemies? In this world of magic and temptation, anything is possible.