Fire Punch

Fire Punch (ファイアパンチ) is a manga series written and illustrated by Fujimoto Tatsuki. It is serialized in Shounen Jump+.

Plot
The world was turned by the "Ice Witch" into that of snow, starvation and madness. Freezing people naturally seeked flame. The "blessing" that was bestowed upon Agni, is it a hope or maybe a curse...?