After the events in 2-4 Cavalry Story 15: In the Pit of Vipers and under a new Troop commander, Captain Karl Bradi, the unit is redesignated C Troop 1-5 Kommando. After their deployment to Earth the unit is resting and refitting, and also cleaning up holdouts on Friesland. Despite this, they are sent to Durham, a planet in the Independent Planets that suffers what is loosely described as a zombie infestation. The unit fights monsters, both real and human, in order to survive on the planet.