Coates Gardner operates as part of the Borgman team’s second generation in 2058, serving under commander Chuck Sweager at the Katsura Research Institute. Tasked with battling the resurgent demonic forces, he partners with rookie recruits like Ken Minai—a cybernetically augmented survivor coerced into joining after a near-fatal encounter. During field operations, Coates provides tactical support to Ken and teammate Sara Cresce as they hunt hostile mystics, though their collaboration is strained by clashing personalities and Ken’s resistance to his forced assimilation.

When Eliza Minai, Ken’s sister, falls under the thrall of the mystics’ master, Coates aids in the high-stakes mission to sever her possession, reinforcing Ken’s determination to save her. Beyond combat, his approachable and collaborative demeanor contrasts with his imposing appearance, defying expectations of aloofness. Though the three-episode OVA offers minimal insight into his past or inner journey, Coates remains a steady, if underexplored, anchor within the team’s evolving dynamic.