Zero Shinagawa, a silver-haired man with piercing yellow eyes, leads a solitary existence defined by rigid routine and emotional detachment. His life takes an unexpected turn when a desperate child enlists his aid to avenge the child’s father—a man driven to mental collapse after losing an SCM duel and abandoned by the victor, Ataru Chuo. The child’s plea echoes Zero’s own unresolved childhood trauma—years of enduring baseless accusations and systemic disbelief from those around him.

Compelled by this shared pain, Zero confronts the vengeful target in a high-stakes quiz duel. Unbeknownst to him, the child covertly supplies answers, crafting an illusion of competence. The partnership shatters when the child coldly reveals a concealed SCM device of their own, manipulating the duel’s outcome to enslave Zero. This betrayal exposes his latent vulnerability, forged by years of isolation and fractured trust.

Stripped of autonomy, Zero becomes a pawn bound by the child’s commands. His forced immersion into the SCM conflict marks a stark trajectory from detached observer to unwilling combatant, his psychological wounds weaponized by others’ opportunism. The consequences of his subjugation define his role within the escalating clash, anchored irrevocably to the machinations of those who exploit his fractured past.