Anime tells the story of a world where robots are part of everyday life and contribute to society. Robots Shinki - 15 -centimeter cute roboty-assistant, equipped with intelligence and emotion and designed to serve the masters. These Shinki can also be equipped with weapons and armor for fighting with each other. Such Shinki called «Busou Shinki», which literally means " armed divine." Shinki Ann (Arnval), Aynes (Altines) and the Rhine (Altrane) are freshman named Masato.But everything changes when a new Shinki Staarf joins them.