"Star Ocean EX" is a 26-episode anime series based on the "Star Ocean: The Second Story" video game, blending science fiction and fantasy elements. The narrative unfolds in a universe where advanced technology coexists with magical abilities, centering on Claude C. Kenny, a young Earth Federation officer, and Rena Lanford, a mysterious girl from the underdeveloped planet Expel. The story begins when Claude is accidentally transported to Expel after experimenting with a teleportation device left by his father. Upon arrival, he encounters Rena, who mistakes him for the "Hero of Light" prophesied to save their world.

The duo embarks on a journey to uncover the truth behind a series of catastrophic events plaguing Expel, including the appearance of destructive "Sorcery Globes" and the sudden disappearance of the planet's sacred relic, the Sorcery Globe. As they travel, they gather a diverse group of allies, each with unique skills and motivations. Key characters include Celine Jules, a talented mage; Ashton Anchors, a swordsman burdened by a curse; and Dias Flac, a skilled warrior with a tragic past. Together, they confront the Ten Wise Men, a group of powerful beings responsible for the chaos, who were created by an ancient civilization and now seek to dominate the universe.

The plot delves into themes of friendship, sacrifice, and the clash between technology and nature. As the group uncovers the origins of the Ten Wise Men and their connection to the ancient civilization of Nede, they must navigate moral dilemmas and personal struggles. The narrative builds toward a climactic battle to prevent the destruction of Expel and the broader universe, with Claude and Rena at the heart of the conflict. The series balances action, character development, and world-building, offering a cohesive adaptation of the game's intricate storyline while exploring the dynamics of its ensemble cast.