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Kaito''''s life was stuck in neutral: nearing forty, overworked, and desperately single. A fleeting glimpse of a mysterious woman, a dropped jade hairpin, and a sudden encounter with Truck-kun change everything. He awakens in a vibrant, ancient marketplace—a world of martial power where he''''s labeled the ''''Weakest Human''''. Lost, confused, and drawing stares in his cheap suit, Kaito''''s problems truly begin when the hairpin he still clutches triggers mass panic. It belongs to the legendary Demon Empress, and by picking it up, he unknowingly invoked an Ancient Law: a binding marriage proposal.