Radiance of Annihilation -Disorder Eclipse-

A catastrophic war caused immense damage to the planet, rendering most of it uninhabitable. As time passed, humanity gradually recovered. They buried records about weapons used during the war so that future generations wouldn't repeat the same mistakes. Even so, no secret stays hidden forever, and there's no shortage of people trying to unearth artifacts from the war for their own malicious purposes. Kouga, a member of the Artifact Management Division, works together with his partner Ikusu to stop these criminals, but when their latest job doesn't go to plan and Ikusu gets kidnapped, something far more sinister than anything they could have imagined is set in motion...

[From Steam]

An adaptation of a CG Collection.