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Two young boys stand in a schoolyard, one with green hair in a yellow hoodie and the other with spiky blond hair in a white shirt, as the blond boy's head is replaced by a large yellow ball; the scene cuts to the same two boys in their adult forms, shirtless and in battle stances against a fiery backdrop, then focuses on a mechanical arm with a glowing red core, followed by a close-up of the arm's joint and a final shot of a determined face with red eyes.