Undead Unluck: Winter Arc

Undead Unluck: Winter Arc is a one-hour special that continues the action-comedy supernatural series following the events of the Autumn battle. The story picks up as Billy seizes control of the Union's Round Table during a blizzard caused by UMA Winter, forcing a confrontation between former allies. Juiz reveals critical information about the artifacts and the Ark's remaining capabilities, urging Billy to rejoin forces with Undead and Unluck to pursue their ultimate goal of defeating God. Billy's refusal triggers a cascade of betrayals and battles involving powerful UMAs on both sides.

This special aired in late December 2025 as a standalone episode rather than a traditional series continuation. The Winter Arc adapts a pivotal chapter from the source material, delivering significant plot developments and character conflicts that reshape the series' direction. Viewers invested in the romantic and comedic dynamics between the main cast will find dramatic stakes raised considerably here, as the narrative shifts toward its endgame.