Tensei Akujo no Kuro Rekishi EP2 - A Lavish Ball Is Better than Obon Dancing

To save Konoha from the monster that kidnaps her, Iana triggers her own death flag. With help from Sol, Ginoford, and the others, Konoha's rescue succeeds. Iana barely has time to relax before an invitation to a ball arrives from the capital—the very ball that's the setting for chapter 3 of The Dark History. If Konoha dances with the prince at the ball, it will lead to a death flag for Iana!