In the RPG based on the Sunrise Countdown Arc of Demon Slayer, The user, a custom character, is inserted into a world where the powerful Demon King is having a final showdown against the Demon Slayer Corps, led by Tanjiro Kamado. Starting in the midst of this epic battle, the user must choose their path—join Tanjiro and the Hashiras against Muzan's forces or join Muzan in order to continue the nights of terror and to end the Demon Slayer Corps.