He is a Warrior of Light from another universe. The original Trigger, his counterpart in a parallel timeline, fought the forces of darkness among the stars for ten thousand years. After falling in battle, he is reborn as a baby in a parallel world: Kengo Manaka.
Armed with the “script,” he soon discovers that he himself is the biggest wildcard. Carmeara's resentment runs even deeper in this world, and the shadow of the mastermind, Zabil, has loomed for thirty million years. A lost Giant, he is forced to wield his power in a young child's body, living out the daily routine of “Smile Superman” with the mind of a battle-hardened warrior.
But after walking through the fires of the ancient past himself, witnessing Yuzare's sacrifice, and understanding Carmeara's deep-rooted love and hatred, he realizes his mission is not simply to repeat history. From his first battle on Mars to the final confrontation with the Evil God, he must not only protect everyone's smiles, but also find true release for an obsession that has crossed time and space.
This is a battle that belongs to him alone: in the name of truth, he will rewrite the ending of light and darkness!