Cross-Dressing Villainess Cecilia Sylvie, Vol. 3 LN

Still disguised as her male alter ego, Cecil, reincarnated villainess Cecilia Sylvie must win all the heroes' affections to avert her future death. But Eins and Zwei, twins whose routes she never played in her past life, are proving an uphill battle. And if that weren't bad enough, it seems like they're hiding something... Meanwhile, fervent advances from Oscar and Gilbert have Cecelia's heart racing! Will Cecelia be able to uncover the twins' secret while hiding her own? Her life depends on it!