In the distant future, a collision of parallel worlds has altered national borders on planet Earth, forcing human civilization to rebuild from scratch. The airborne city-ship of Musashi embodies this new world order, where Edo-period buildings coexist with modern technology. At Musashi Ariadust Academy, the city's youth study combat arts, history and politics as they prepare to be future leaders. But the future looks questionable in the hands of student council president Aoi Tori, a perverted troublemaker.