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Carla (カルラ) is one of Renya's friends from the hidden village. She seems to have affection for Renya and was worried about his poor academic performance to the point of making him take a crash course without taking a break. Carla has been seen wearing a mysterious pendant.
When she is found by Andreas Weinberg after being captured during an attack on the village, it is revealed that her real name is Claire Le Britannia, who is supposed to be the next Empress of the Great Britain.