The Magical Revolution of the Reincarnated Princess and the Genius Young Lady Vol 2,3 (2 Novels) Paperback
by Piero Karasu (Author), Haydn Trowell (Translator), Yuri Kisaragi (Artist) 
A RIFT IN THE ROYAL FAMILY! With the help of her assistant―the genius young lady Euphyllia―Princess Anisphia has successfully subdued the dragon that attacked the Kingdom of Palettia. Nonetheless, the furor over Euphyllia’s canceled betrothal continues. To make matters worse, Anisphia discovers a devastating secret about Lainie, who holds the key to the prince’s strange decision. And that’s not the only secret―it’s just the beginning of a grand plot enveloping the entire royal palace!