The Magical Revolution of the Reincarnated Princess and the Genius Young Lady, Vol. 5 (manga)

Lainie, the daughter of a baron, is the mysterious girl at the center of the scandal over Euphie’s broken engagement. Anis, the reincarnated princess, can’t help but feel there’s something odd about Lainie, so she conducts a checkup on her-and comes to a shocking conclusion! At the same time, Anis's brother Algard, the prince of Palettia, takes the lead in a grand scheme that’ll impact the whole kingdom…