After his village succumbs to inextinguishable flames he is left constantly on fire, leaving him in anguish and vowing to get revenge.

On a future, frozen Earth, the world has been purportedly barren by the Ice Witch, who is among a few who possess special abilities known as "Blessings".

One day, a man named Doma, another Blessed, visits the village, offering to take Agni to his city, Behemdorg.

After a brutal confrontation, Judah incapacitates Agni, aiming to take his head to Behemdorg, where Sun is imprisoned to generate electricity for the city.

Feeling purposeless, Judah attempts to burn herself with Agni's flame, but the Ice Witch intervenes, decapitating her and vanishing with her head.

She plans to end the Ice Age by transforming Judah into a "World Tree" that will consume all life on Earth, warming the planet.

Though initially forgiving, Agni is overtaken by memories of Luna's death, killing Doma and several children in a fugue state.

Returning to the village, Agni finds a massive tree where Judah has absorbed the life energy of his followers, the "Agnists".

They settle in a salt mine with a small group of survivors from Doma's community, though Agni's mental state begins to deteriorate over time.

In the ensuing battle, Sun dies, and Judah destroys part of Agni's brain, erasing his memories, and completes the tree ritual to warm the Earth.

Hundreds of years later, Judah remains in the tree, forgetting her whole life and her own name; millennia pass, and she wonders to herself if she will be trapped there forever.

Written and illustrated by Tatsuki Fujimoto, Fire Punch was published on Shueisha's Shōnen Jump+ website from April 18, 2016,[3] to January 1, 2018.