In Another World, My Sister Stole My Name. Volume 3

In the world of the mirror, Ichika has her hands full-with her work as a saint, her gradually developing relationship with Noah, and her awkward distance with her sister, Karen. In the midst of it all, the king announces that Ichika, Karen, Cecil, and Noah are to go on a diplomatic visit to their neighboring country, Veldeva! Ichika is trying her best to prepare for the trip, studying up on history and magic, when suddenly, a beautiful but mysterious girl appears before her-?!