"Exper Zenon" is a science fiction anime series set in a distant future where humanity has colonized multiple star systems. The narrative centers on Zenon, a young pilot from the remote colony of Eridanus, who becomes embroiled in a galactic conflict after discovering a mysterious ancient artifact known as the "Core." The Core is a highly advanced piece of technology with the potential to revolutionize energy production, but it also harbors dangerous capabilities that could destabilize the fragile peace between the colonies and the central governing body, the Galactic Union.

Zenon's discovery attracts the attention of various factions, including the Union's military, a rogue mercenary group called the Black Nebula, and a secretive organization known as the Order of Aether. Each group seeks to control the Core for their own purposes, leading to a series of escalating confrontations. Zenon, initially reluctant to get involved, is forced to take a stand when his home colony is threatened. Alongside a diverse crew of allies, including the skilled engineer Lyra, the enigmatic warrior Kael, and the Union defector Captain Ryn, Zenon navigates the complexities of interstellar politics, betrayal, and warfare.

The series explores themes of power, responsibility, and the ethical implications of advanced technology. As Zenon and his crew uncover the true origins of the Core, they learn of an ancient civilization that once wielded its power, only to bring about their own downfall. This revelation forces Zenon to confront the moral dilemmas of using the Core, as its misuse could lead to catastrophic consequences for the galaxy. The narrative builds toward a climactic battle that determines the fate of the Core and the future of humanity's interstellar society. Throughout the series, character development is intertwined with the overarching plot, as Zenon evolves from a reluctant hero to a decisive leader committed to protecting the galaxy from the dangers of unchecked ambition.