The Youma Master spearheads the demonic resurgence threatening Megalocity in the 2058 conflict, acting as the primary antagonist. This entity commands the Youma with the goal of unleashing an all-consuming plague of evil upon the city. Its leadership directly challenges the new generation of Borgman warriors, forcing a decisive confrontation to prevent humanity's destruction. Ken, a reluctant Borgman recruit, discovers he may share significant biological or thematic connections with the enemy forces under the Youma Master's command, suggesting potential ties to the demonic hierarchy.