Schwarzwelt—a mysterious spatial phenomenon—has appeared over Antarctica and has the ability to dismantle all approaching objects at a molecular level. If left unchecked, the distortion will spell disaster for humanity as it will consume the world with its expansion. After exhausting all other options, an expedition group is put together to investigate the Schwarzwelt to uncover its mysteries and, hopefully, a way to stop it. Among the convoy is Jin—a member of one of the group's Strike Teams. Following the sudden crash landing of their ship, the Strike Teams mobilize to scope out the area within the Schwarzwelt. Using their "Demonica" suits, the team steps out into the strange, desolate landscape, only for their commander to be instantly decapitated by a mysterious creature. Shortly afterwards, the ship comes under attack by beings that their Demonicas analyze as various mythological demons. Trapped in this world where these otherworldly entities rule, Jin strikes a deal with a demon to get the remainder of the ship's crew out of the Schwarzwelt alive. As they begin their strange journey, he learns that it is not easy to work alongside the enemy when the crew refuses to cooperate with them all while the demons have their own agenda to fulfill. [Written by MAL Rewrite]