"Ring of Gundam" is a short anime film set in the Universal Century timeline of the Gundam franchise. The story takes place in the year UC 0223, long after the events of the original Mobile Suit Gundam series. Humanity has colonized space, and the Earth Federation maintains control over the colonies. The narrative centers on a mysterious structure known as the "Ring," a massive orbital ring surrounding Earth that serves as a symbol of peace and prosperity. However, the Ring also harbors dark secrets tied to the history of the Universal Century.

The protagonist, a young boy named Eiji, lives on the Ring with his mother. Eiji is fascinated by the legends of the Gundam, a legendary mobile suit from the past. His life changes when he encounters a damaged mobile suit resembling the iconic RX-78-2 Gundam. This mobile suit, piloted by a mysterious girl named Mally, becomes a focal point of the story. Mally is on a mission to uncover the truth behind the Ring and its connection to the Gundam legacy.

As Eiji and Mally delve deeper into the mysteries of the Ring, they uncover a conspiracy involving the Earth Federation and remnants of past conflicts. The Ring, initially perceived as a symbol of unity, is revealed to be a weapon of mass destruction designed to maintain control over the colonies. The story explores themes of rebellion, the cyclical nature of war, and the enduring legacy of the Gundam as a symbol of hope and resistance.

The narrative is driven by the interactions between Eiji and Mally, as well as their encounters with various factions vying for control of the Ring. The film blends action, mystery, and political intrigue, staying true to the thematic elements of the Gundam franchise. The climax involves a confrontation that forces Eiji and Mally to make difficult choices about the future of humanity and the role of the Gundam in shaping it. The story concludes with an open-ended resolution, leaving room for interpretation about the ultimate fate of the Ring and its inhabitants.