Lady Arlecchino once studied at Sumeru Academy long ago. Before becoming the head of the Hearth House, she learned the secrets of learning and existence, having with her only the Pyro Vision and a hatred of the hot climate. Arlecchino finds it easy to study, unlike many other students. Therefore, she often conducts experiments that do not correspond to the program. If the top of the academy finds out exactly what experiments Arlecchino is conducting, then she may be expelled.