Fire Punch

Fire Punch (ファイアパンチ) is a manga series written and illustrated by Fujimoto Tatsuki. It was serialized in Shounen Jump+ from April 18, 2016 to January 1, 2018. Viz Media has licensed it for English release.

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