In a future where Earth and its colonies are divided by warfare, the powerful organization Gjallarhorn maintains order on Earth while Mars struggles under its control. Witnessing the harsh conditions on Mars, noblewoman Kudelia Aina Bernstein joins the fight for Martian independence. To negotiate with Earth, she enlists the help of Chryse Guard Security (CGS), led by child soldiers like Mikazuki Augus and Orga Itsuka. When Gjallarhorn threatens Kudelia's mission, Orga and his team must protect her and seize control of their fates, spurred on by unexpected events set in motion by their enemies.