In the year C.E. 73, tensions between Naturals and Coordinators escalate, sparking a new conflict between the Earth Alliance and PLANT. Sven Cal Bayan, a skilled Natural pilot from the elite Phantom Pain unit, diligently executes missions against Coordinators. Meanwhile, Selene McGriff, a Coordinator scientist at the neutral DSSD organization, works on the innovative GSX-401FW Stargazer mobile suit for space exploration. Despite their contrasting origins, fate will intertwine their destinies as the war rages on.