In a cyberpunk future ravaged by natural catastrophes and irresponsible human actions, Mashin City emerges as humanity's last refuge. Surrounded by imposing walls and operating like a sophisticated computer program, this city is the only hope for survival in a destroyed world. Here, machines and humans not only coexist, but merge into a single body, creating a new form of life.
Benjiro, a genius hacker and an excellent swordsman, makes a living as a cybercriminal. In a world where large corporations control every aspect of life in Mashin City, Benjiro fights against injustice and the dark secrets these powerful entities hide. As he delves deeper into the digital underworld, he uncovers conspiracies that threaten not just the city, but the future of all humanity. Now, he must decide between continuing his life of crime or using his skills to save what's left of civilization.