"Mobile Suit Gundam 00F" is a manga series set in the same universe as "Mobile Suit Gundam 00," taking place between the first and second seasons of the anime. The story centers on Fon Spaak, a skilled Gundam Meister working for the shadowy organization Fereshte, a support unit for Celestial Being. Fereshte operates in secrecy, using outdated or prototype Gundams to assist Celestial Being's primary operations without drawing attention to themselves.

The narrative explores the covert missions undertaken by Fon Spaak and his team, who are tasked with maintaining Celestial Being's influence while remaining undetected. Fon Spaak pilots the GNY-001F Gundam Astraea, a prototype of the Gundam Exia, and later upgrades to the GNY-001F2 Gundam Astraea Type F2. His missions often involve gathering intelligence, eliminating threats, and supporting Celestial Being's broader goals of eradicating war through armed intervention.

Key characters include Fon Spaak, a reckless yet highly skilled pilot with a mysterious past, and Hanayo, an artificial intelligence system that assists him in combat. Other members of Fereshte, such as Hixar Fermi and Ruido Resonance, play supporting roles, contributing to the team's operations and providing insight into the organization's internal dynamics. The series also features appearances by characters from the main "Gundam 00" storyline, tying it closely to the larger narrative.

The plot delves into the moral and ethical dilemmas of Celestial Being's mission, as well as the personal struggles of Fon Spaak, who grapples with his role as a shadow operative. The series expands on the world-building of "Gundam 00," offering a deeper look at the political and technological landscape of the timeline. Themes of loyalty, sacrifice, and the consequences of intervention are explored through the characters' actions and the outcomes of their missions.

"Mobile Suit Gundam 00F" provides a complementary perspective to the main series, focusing on the behind-the-scenes efforts that sustain Celestial Being's operations. It enriches the "Gundam 00" universe by highlighting the complexities of its covert activities and the individuals who carry them out.