In Lunaria, a planet where Magic and technology coexist, Oliver Kim, a military researcher, wants to build an Elemental Gun, a weapon capable of using Elemental Magic by using the Magical Energy in the environment. After his first prototype crumbled after a couple of shots, Oliver realizes he needs more durable materials to withstand the power of the Magic being fired by the Elemental Gun. After asking for more funding from Colonel Kenta Miyamoto, he is promised more resources after the completion of an important mission in Muna, one of planet's five moons. Oliver embarks in a mission with a one week deadline alongside Platoon 12. Oliver is tasked with investigating a new material found in a monster-infested cave, while Platoon 12 focuses on taking out the monsters. How will Oliver and Platoon 12 handle the mission when things go awry on the first day?