Boss Gyan instigates the central conflict surrounding the Moyamoya statue. As its owner, he hires Ultraman Company to secure the statue's display at a department store event hall. Gyan orchestrates the statue's theft himself, framing it as a security failure to execute a deceptive scheme for acquiring the artifact. His plan centers on stealing what he publicly declares is the authentic statue. When Ultraman Company accepts responsibility to recover it within four days, their investigation exposes Gyan's role. Further scrutiny reveals the stolen item as a replica, while the genuine statue resides on Peropero Island with Gyan's brother, Dr. Yango.

This discovery uncovers Gyan’s fraudulent motives to leverage Ultraman Company's resources for obtaining the real artifact. His familial tie to Dr. Yango entangles him in a broader conflict over the statue's ownership and mystical significance. The plot culminates in a confrontation on Peropero Island, intersecting Gyan's pursuit with Dr. Yango’s activities and the interference of Princess Zara, who is corrupted by demonic influence.

Gyan operates within a criminal framework, indicated by his "Boss" title and use of underlings. His actions drive the narrative conflict, though his direct involvement in on-island events remains secondary to Dr. Yango and Princess Zara.