In a dystopian future where Japan's political structure has collapsed following the Great Tokyo War, the country is divided into 10 independent nations. Each nation is controlled by a gang led by a "Best," a human-proclaimed prophet possessing destructive superpowers. Nozomi Moritomo is a "Rest"—an ordinary girl who has just begun her career as a rookie in the local gang. She aims to assist Masami Utoku, her childhood friend and role model, who is a Best, in the ongoing territorial dispute. When Masami suffers severe injuries and becomes unable to fight, Nozomi decides to undertake a mission to fulfill the requests sent to Masami from across Japan. During her journey, she encounters Yukina Kosaka, a shy girl with no sense of direction; Ai Hibiki, an upbeat girl who loves eating; and Chiaya Misono, a quiet and mysterious girl who wears a gas mask. Together, the four girls travel throughout the country on their motorcycles, becoming involved in territorial wars, disputes, and even suspicious conspiracies.