Chrome Shelled Regios(2009)

鋼殻のレギオス

The world of tomorrow is an arid wasteland. Humans must live in domed cities to escape the threat of mutant Contaminoid monsters. In this future, mysterious Layfon struggles to keep his violent past hidden from his fellow student soldiers at the military academy. Unfortunately, his former life might be impossible to keep secret – and the truth could tear his team apart.