"Mobile Suit Gundam Wing: Episode Zero" serves as a prequel to the "Mobile Suit Gundam Wing" anime series, providing backstory and context for the main characters and events leading up to the conflict depicted in the show. The manga delves into the origins of the five Gundam pilots—Heero Yuy, Duo Maxwell, Trowa Barton, Quatre Raberba Winner, and Chang Wufei—and explores their motivations, training, and the circumstances that shaped them into soldiers.

The narrative begins with the political landscape of the future, where the Earth Sphere Unified Nation exerts control over the colonies in space. Dissatisfaction among the colonies grows, leading to the formation of the Organization of the Zodiac (OZ), a military faction aiming to suppress rebellion. In response, the colonies secretly develop the Gundams, advanced mobile suits designed to challenge OZ's dominance. Each Gundam is piloted by a young soldier trained for this purpose.

Heero Yuy, the pilot of Wing Gundam, is revealed to have been raised as a child soldier by the mercenary Odin Lowe. His harsh upbringing instills in him a cold, mission-focused demeanor. Duo Maxwell, pilot of Deathscythe, is an orphan from the L2 colony who adopts the persona of the "God of Death" to cope with his traumatic past. Trowa Barton, pilot of Heavyarms, is a former circus performer with a mysterious background, while Quatre Raberba Winner, pilot of Sandrock, hails from a wealthy family but struggles with the moral weight of his actions. Chang Wufei, pilot of Shenlong, is driven by a deep sense of justice and a desire to avenge his clan's honor.

The manga also introduces Relena Peacecraft, a key figure in the series, and her connection to the pacifist ideals of her family. Her brother, Milliardo Peacecraft, later known as Zechs Marquise, is depicted as a skilled OZ officer with conflicting loyalties. The story highlights the personal sacrifices and ethical dilemmas faced by the characters as they prepare for the Operation Meteor mission, which involves deploying the Gundams to Earth to strike against OZ and the Earth Sphere Unified Nation.

"Episode Zero" provides crucial context for the relationships and rivalries that define the main series, such as the bond between Heero and Relena, the rivalry between Zechs and Heero, and the camaraderie among the Gundam pilots. The manga also explores themes of war, identity, and the cost of rebellion, offering a deeper understanding of the characters' actions and motivations in "Mobile Suit Gundam Wing." By focusing on the events preceding the anime, "Episode Zero" enriches the overarching narrative and enhances the viewer's appreciation of the series.