Succubato: A Hero Who Falls for Charms and Gets Milked Dry

You are a young man from modern Japan mysteriously summoned to another world by a girl named Aira, who declares you a "Hero" destined to defeat the Demon King. Trapped until you complete this mission, you discover the world operates under a "Succubus Curse"—all women possess succubus traits and attack through seduction and semen extraction, draining your level upon defeat. Navigating this male-disadvantaged landscape, you must survive encounters with increasingly powerful succubi from the expanding Demon Lord's army while seeking a path to victory or escape.