World War II. Guest and their squad members are deployed to the Eastern Front as part of the German forces, fighting the Soviet army. However, the squad members have been killed one by one, and eventually, only Guest survived. Still, the battle is not over. Guest was using a Karabiner 98b bolt-action rifle; upon realizing the rifle was out of ammunition, Guest attempted to reload using a stripper clip containing five 7.92 x 57mm Mauser rounds. Suddenly, a flash of light occurred, and the Karabiner 98b bolt-action rifle in their hands transformed into a woman.