The Prince Is in the Villainess' Way!, Volume 4 by Hiiro no Ame

In disguise, Iris moves to the neighboring country and becomes the princess' educator. But when she meets Prince Al, he turns out to be a cool-headed flirt, who, most-shockingly of all, is actually very sweet with Fiona... Can Iris figure out the truth in time to save Fiona from her fate?
Binding: Paperback / softback