"Kiddy Grade Movie" serves as a condensed retelling of the original "Kiddy Grade" anime series, blending action, science fiction, and political intrigue into a fast-paced narrative. Set in a futuristic universe governed by the Galactic Organization of Trade and Tariffs (GOTT), the story centers on Éclair and Lumiere, two agents of the ES Force, a special division tasked with resolving interstellar disputes and maintaining order. Éclair, a brash and physically powerful combat specialist, contrasts with Lumiere, a calm and analytical strategist with advanced technological abilities. Together, they form a dynamic duo, balancing their contrasting personalities to tackle missions with precision.

The plot unfolds as Éclair and Lumiere are assigned to investigate a series of escalating conflicts involving powerful corporations and political factions. Their missions reveal a deeper conspiracy threatening the stability of the galaxy, involving shadowy figures manipulating events from behind the scenes. As the agents delve further, they uncover secrets about their own origins and the true nature of their abilities, which are tied to advanced nanotechnology. This revelation forces them to confront their identities and the ethical implications of their roles within GOTT.

The narrative explores themes of power, corruption, and the moral ambiguity of authority, as Éclair and Lumiere navigate a world where alliances are fragile and trust is scarce. Their journey is marked by intense action sequences, strategic confrontations, and moments of introspection, as they grapple with their purpose and the consequences of their actions. The film condenses the original series' arcs, focusing on key events and character developments while maintaining the core elements of the story. By the conclusion, the agents face a climactic showdown that tests their resolve and solidifies their partnership, leaving a lasting impact on the galaxy's future.