"Garzey's Wing" is a three-episode OVA series that blends fantasy, action, and isekai elements. The story centers on Chris, a high school student who is suddenly transported to a parallel world called Metafalss. In this world, two warring factions, the Byston Well and the Ashanti, are locked in a struggle for dominance. Chris is summoned by the Byston Well as their "Garzey," a chosen warrior destined to lead them to victory. Upon arrival, he discovers that his soul has been split, with his physical body remaining in the human world and his spirit inhabiting a new form in Metafalss.

Chris is tasked with protecting the Byston Well and aiding their fight against the Ashanti, who seek to enslave the native population. He is joined by a group of allies, including a young girl named Lufia, who serves as his guide and companion. Throughout the series, Chris grapples with his dual existence, struggling to balance his responsibilities in both worlds while navigating the moral complexities of the conflict. The narrative explores themes of identity, duty, and the consequences of war, as Chris is forced to confront the harsh realities of the world he has been thrust into.

The plot unfolds through a series of battles and strategic confrontations, with Chris gradually learning to harness his newfound powers as the Garzey. The Ashanti, led by the ruthless General Zeyful, employ advanced technology and dark magic, posing a significant threat to the Byston Well. As the conflict escalates, Chris must make difficult choices that test his resolve and challenge his understanding of justice. The series concludes with a climactic showdown, leaving the fate of Metafalss and its inhabitants hanging in the balance. The story is marked by its fast-paced action, intricate world-building, and exploration of the protagonist's internal struggles.