Giso commands the Burrstone of the Mountains, a fortress-like support mecha layered in heavy armor and armed with over five hundred missile launchers and atomic bombs, weaponry potent enough to obliterate entire regions. As a key operative of the Hau Dragon organization, he engages in high-stakes missions to reclaim the stolen Zeorymer of the Heavens, advancing the group’s ruthless agenda of global conquest.

His loyalty to Hau Dragon is complicated by a silent, unreciprocated yearning for Rokfel, his comrade who pilots the Dinodilos of the Earth. Rokfel’s own attentions fixate on Saiga, operator of the Omzack of the Thunder, forging a volatile triangle of rivalry and resentment. These tensions stem from deliberate psychological instabilities implanted by their creator, flaws engineered to sabotage cohesion and guarantee failure during pivotal missions.

During the climactic battle against Zeorymer, Giso joins Rokfel and Saiga in a three-pronged assault. Strategic unity crumbles under Saiga’s reckless arrogance and the simmering distrust between the pilots, culminating in their collective downfall. The narrative underscores Giso’s unwavering allegiance to Hau Dragon’s cause and the unresolved ache of his suppressed emotions, though his personal history remains anchored solely to his role within the organization and his fraught interactions with fellow pilots, as depicted in the core OVA storyline.