Ace Avalanche, Earth's strongest Ranker, conquers Heaven's Gate after a grueling ten-year struggle through catastrophic dungeons—only to discover the planet's annihilation was merely a prologue. Granted a single wish, he's reborn into his impoverished teenage self three months before the first Gate emerges. The multiverse strips away his active abilities and binds his heart, yet the System recognizes him as a Ranker, creating an exploitable advantage. Working in secret, Ace accumulates devastating passive skills—Attack Speed, Critical Strike, Lifesteal, and countless others—while humanity remains oblivious to the coming apocalypse. As the world hurtles toward its first catastrophe, one man silently builds an unstoppable arsenal through skills nobody else dares to master.