With Arata's training camp now complete, he's sent off to his first official post as a PMSC employee. Determined to atone for the sins he unwittingly committed, he tackles his new job with zeal, trying his best to keep as many people alive as possible. Unfortunately, the mercenary life is a harsh one, and the darkness within PMSC runs far deeper than Arata could have ever imagined. Can he stay true to his ideals despite coming face-to-face with the horrors of war?