The Condemned Villainess Goes Back in Time and Aims to Become the Ultimate Villain (Light Novel) Vol.4

SHE-DEVIL'S IN THE DETAILS

When an aristocrat is murdered on his way home from a brothel, one of Claudia's rivals points the finger at her. After all, it's no longer a secret that she controls a crime syndicate. Just as Claudia launches an investigation to clear her name, a new enemy steps onto the scene: the bewitching Niamilia, a bridal candidate brought over to keep her country from going to war! Who's the real villainess among the would-be future queens? Hidden agendas clash as the curtain rises on the deciding event...a masquerade ball!