the story takes place in the distant future. at that time, the earth had been completely destroyed by the pollution created by humans, and even more pollution caused evil monsters to occupy the living space of human beings. in desperation, humans could only move to the "self-discipline mobile city" with independent consciousness, and these cities fought fiercely to compete for very few resources. a riot occurred in the college's urban jieerni. lei feng (voiced by okamoto nobuhiko), a freshman who had just entered the general education department, showed his outstanding ability to adapt and fight in the chaos. therefore, he was discovered by the student president and transferred to the martial arts department. he was also qualified to join the 17th urban guard team. fili, who is cold outside and warm inside, nina, who is dedicated and tough, and shanid, who is frivolous but very reliable, are willing to pay the price of bleeding in order to protect the city on which they rely on. eee