In a world devastated by ice and snow, civilization stands on the verge of collapse due to the elusive Ice Witch. The struggle against the cold has exposed humanity's darkest side, resulting in cults, violence, and the persecution of the Blessed—individuals born with supernatural abilities. Agni and Luna, orphaned Blessed with regenerative powers, make the best of their circumstances within a small community of elders; their mutual affection provides a distraction from the uninhabitable climate. However, their fragile peace is shattered when army commander Doma passes through and burns down the village where they are seeking refuge, including Agni's beloved sister. Doma's flames do not cease until they have reduced their target to ash, and because of Agni's remarkable regeneration, he remains on fire and in constant, excruciating pain. After nearly a decade of enduring the agony, Agni has conditioned himself to withstand Doma's flames. Yet, his burning vengeance remains as fierce as it was on the day Luna was taken from him. As Agni crosses a frozen wasteland, he vows to avenge his sister and kill Doma.