The backgrounds will feature in a pivotal scene in the story where the twelve warriors first assemble and the fight begins.
The stories of the one shot and Jūni Taisen are connected.
Naoto Hosoda (The Devil is a Part-Timer!, Shuffle!) is directing the series at Graphinica (Chain Chronicle: The Light of Haecceitas, Expelled from Paradise).
The location featured is an abandoned building that stands near a ghost town, as well as viewing platforms and the entrance to the building.