Katsuma serves as little more than an errand boy for his demanding female bosses, repeatedly failing in his confrontations with the hero known as Silverstar. During one such encounter, his superiors spring a trap that ensnares both him and his opponent. Upon regaining consciousness, he discovers Maria, another Silverstar, tending to his wounds with genuine compassion. Drawn to her warmth, he forms a deep bond that grants him extraordinary powers, prompting him to plot his vengeance.