Season One begins with Kaito Arin, a weak, sickly boy who dies at age sixteen after a life filled with regret. He was talentless, ignored, and powerless—always watching others shine while he faded into the background. As his vision goes dark, one thought echoes in his mind:
"If I had one more chance… I wouldn't live like this."
He wakes up crying—not in a hospital, but in a new world.
Kaito has been reincarnated into the body of a five-year-old noble child in a brutal fantasy realm ruled by strength, magic, and bloodlines. This world worships power. The weak are discarded. But this time, something is different.
Inside Kaito exists a frozen black core—a mysterious power known as Absolute Zero, an ability said to erase even gods from existence. The catch? The power is sealed, slowly unlocking as Kaito grows mentally and emotionally.
Season One follows Kaito's early life as he pretends to be harmless while secretly training his mind and body. Unlike typical heroes, he is calm, calculating, and emotionally detached. He understands cruelty because he lived it once.
At age seven, Kaito shocks everyone by defeating a trained adult mage during a magical aptitude test—without chanting a single spell. Rumors spread. Nobles grow wary. The royal family begins watching him.
As assassins are sent to test—or erase—him, Kaito realizes this world will never allow him peace. So he makes a decision:
He will not become a hero.
He will become untouchable.
By the end of Season One, Kaito enters the Imperial Academy, where geniuses and monsters gather. His power has only unlocked 10%, yet he already stands above most students. In the final episode, an ancient being sealed beneath the academy whispers his name for the first time.
"Absolute Zero… has returned."
Kaito smiles for the first time in his second life.
Not out of joy—
but anticipation.