"Demon Days: X-Men #1" is a variant cover comic book published by Marvel Comics in May 2021. The cover art is done by Mark Brooks and features the X-Men team within a demon-themed setting. This modern age comic is part of the Demon Days series, which explores a unique twist on traditional superhero stories. Written in English, this issue is focused on demons and superheroes, making it a collectible and desirable item for fans of the X-Men and superhero comics.