The Dark History of the Reincarnated Villainess, Vol. 9 (manga)

To avoid the Saint Konoha route, Iana is supporting Isaac as the next Saint candidate instead! But as they progress to the third trial, the Knights of Schwartz make their move. When Isaac gets trapped in the True route, Iana uses a cursed book to save him. However, in doing so, Iana’s dark history is revealed…