Mobile Suit Gundam: The Witch from Mercury unfolds in A.S. (Ad Stella) 122, an era when a multitude of corporations has entered space and built a huge economic system around mobile suits. From the remote planet Mercury, a lone girl transfers to the Asticassia School of Technology, an academy run by the Beneritt Group, the force that dominates the mobile suit industry. Her name is Suletta Mercury, and with a scarlet light burning in her pure heart, she walks step by step into a new world shaped by competition, privilege, and the machinery of corporate power.
At Asticassia, Suletta's arrival draws her into the lives of Miorine Rembran, Elan Ceres, Guel Jeturk, and Shaddiq Zenelli, students whose rivalries and ambitions reflect the larger tensions surrounding the school. Set in a distinct Gundam timeline, the series combines academy drama with mecha conflict and the political influence of the companies that rule space, following Suletta as she tries to define herself in an environment where every duel, alliance, and decision can carry consequences far beyond the classroom.