A decade after the Great Tokyo War, every Japanese prefecture has fractured into sovereign states. Each state is governed by a prophet known as a "Mosa" and an army called the "Mob," as they begin vying for dominance over neighboring territories. Four "Mob" girls from the Saitama clan—Nozomi, Yukina, Ai, and Chiaya—are commanded by their "Mosa" to traverse Japan on motorcycles, mediating the various conflicts that arise between nations and clans.