Chrome Shelled Regios: Secret Side

In a future where pollution has led to the spread of dangerous creatures, humans reside in mobile cities known as Regios. Within one of these cities, Zuellni, which functions as a school, new student Layfon Alseif joins the 17th Martial Arts Studies Unit under the leadership of third-year student Nina Antalk. He takes part in various adventures as the narrative restructures the original novel.