Isekai de Inmashi Harem

Ichiro was an unremarkable office worker and lifelong otaku—until the day he found himself summoned to a world far beyond his own. Yet unlike the heroes of the stories he so loved, he was promptly branded an "Outsider," a rare and pitiable exception blessed with no special abilities whatsoever. A truly powerless soul cast into a land of wonder, he seemed destined to amount to nothing in this unfamiliar realm. But fate had concealed a forbidden secret within him. Soon after his arrival, Ichiro underwent an awakening unlike any other: dormant inside him lay the power of an incubus, a demonic gift granting him the ability to captivate and dominate women through his very essence. What everyone had mistaken for utter weakness was, in truth, a force this world had never anticipated. Now armed with the seductive arts born of this supernatural nature, Ichiro sets out to carve out his place in the new world, winning over one captivating beauty after another. From alluring, mature women to youthful, spirited heroines, his harem grows steadily as his hidden power draws them ever closer.