Chrome Shelled Regios by Shūsuke Amagi

Translated from Japanese Completed Action Fantasy Romance Supernatural School Life Science Fiction Swords

In this school fantasy story set in the distant future, creatures contaminated by pollution have overtaken the land, forcing humanity to live in isolated mobile cities called Regios. One such city named Zuellni is a self-contained school in which freshman Layfon Alseif has just enrolled. Layfon reluctantly joins the 17th Military Arts Platoon led by the third-year student Nina Antalk and embarks on a series of adventures.

Alternative names : 鋼殻のレギオス / Kōkaku no Regiosu

1: Chrome Shelled Regios
2: Silent Talk