Finding the cure to Cosmos Plague wasn't what he expected it to be. Arch Extent has been searching for a cure to Cosmos Plague for years. He travels to a dangerous and restricted planet known as Division 5 in an attempt to find an answer. Winter, a skilled huntress with an icy mutation, has been searching for a place to belong. When the contract of a lifetime is offered to her, she takes it without hesitation. Her contract brings her to a hidden facility where she is exposed to Cosmos Plague, and a man who quickly discovers she is immune to the very thing wiping out humanity on Earth. Arch Extent becomes obsessed, fascinated by her biology, and is willing to do anything to unlock the secrets of how Winter is immune. Arch Extent makes a deal with Winter, and she becomes his bodyguard as they traverse across Division 5. The thing is...Arch Extent isn't the only one searching for a test subject like Winter.