Undead Unluck: Winter Arc is a special anime that premiered in fall 2025, produced by E&H Production.

About the production: the story comes from a manga, there is 1 episode of about 48 minutes and its current status is "finished".

Its main genres are action, comedy, sci-fi and supernatural, with themes such as Shounen, Foreign, Urban Fantasy and Travel.

On AniList, Undead Unluck: Winter Arc has an average score of 76%, a very good score, and appears on 20,446 users' lists.

The franchise continues in or follows from: Undead Unluck and Undead Unluck 2nd Season.

Billy betrays the Union and seizes the Round Table. Amidst a blizzard caused by UMA Winter, he receives a report on the Autumn battle and learns Undead and Unluck are evolving. Juiz appears, revealing to him that the artifacts are weapons meant to defeat God and that the Ark can only perform one more loop. She urges Billy to join forces once more and stake everything on Unluck to achieve their shared goal: “defeat God.” However, Billy declares that they cannot work together. Juiz realizes Billy’s true intention—to obtain Ark and Apocalypse—but before she can act, Billy drags them into a brutal clash involving UMAs on both sides. (Source: TMS Entertainment)

Official synopsis from AniList.