The Ballroom Dance of Hell That Became a Bloodbath [Serialization Begins]

Once a year, the magnificent "Spring Grand Ball" is held over the course of seven days. Duke's daughter Diana is told by her fiancé Leonhardt not to come on the first day. She has no shortage of suspicions about the vague "circumstances" he glosses over—she already knew that he was intimate with multiple young ladies. Expecting anything would be pointless, and Diana had resigned herself to this fact. But on the morning of the first day, as she prepares to leave, a thought suddenly occurs to her. What if she were to invite his mistresses to the same ball?