[Machine Translation] The Tempest Opening Festival has finally begun. Rimuru and the other demons under his command were all preparing for the festival. Starting with a concert, there was a research presentation that had the technicians drooling, and a giant labyrinth that turned into a huge attraction, all of which took the participants by surprise. In the main event, the "hero" Masayuki "Flashlight" announces his participation, and the audience gets excited whether they want to or not. What will the encounter between the demon king Rimuru and Masayuki produce? And what will be the fate of Ms. Veldra, who waits for the adventurers at the bottom of the labyrinth...?