The social media event celebrating the Korean-language launch runs from October 22 through November 8. Four lucky participants will be chosen at random to receive a Demons' Nights Fever acrylic stand set. To enter, players simply need to post a photo verifying their purchase of the Demons' Nights Fever Korean physical package alongside a congratulatory message, either in the comments of the official Arc System Works Asia blog event post or on X (formerly Twitter) or Instagram with the required hashtags. Winners will be announced on November 11 via the official Arc System Works Asia social media channels.

Meanwhile, Arc System Works Asia is also serialising an official webtoon titled Demons' Nights Fever Has Begun across eight chapters on its official social media channels, comically depicting the fateful encounter between Koshiro, a programmer full of hatred for the world, and Gigasgoides, the Grim Reaper holding the custom resurrection programme Demons' Nights Fever. The development roster features producer, original concept, and scenario writer Sohei Niikawa, character designer Yuji Himukai, composer Tatsuya Yano, and theme song artist syudou. A Korean-language trailer introducing the game's core features has also been released.