In 1910 Japan, a boy named Iwamoto Kodou serves the military as an agent for the unexplainable. While his peers attend school, he travels across the country completing assignments that pull him into brushes with the supernatural. Each mission sends him to a different corner of history, tasking him with investigating phenomena that official records will never acknowledge. Temples hold secrets. Remote villages shelter impossible things. Kodou must navigate these encounters with the composure of someone far older than his years, learning that Japan's hidden past runs deeper than textbooks suggest. The show balances historical grounding with creeping dread, treating supernatural occurrences as genuine problems requiring real solutions rather than spectacle. Kodou remains calm under pressure, but the weight of what he discovers accumulates. Viewers seeking period piece atmosphere paired with genuine unease will find something here: a story that uses early twentieth-century Japan as both setting and character, where every assignment peels back another layer of the nation's stranger truths. The mysteries compound. The boy grows quieter.