Amarudina was the Princess of the Sand Empire until her early death due to an unknown illness that rapidly spread throughout the empire when she was a child. She was one of the many people affected by the illness. Amarudina was also Taishi's younger sister, whom he cares greatly about. Her death and their mother's lack of concern for the Empire's state motivated Tashi to help his subjects. When Amarudina was still alive, she wanted to help her subjects as well, which almost caused her to drown as she was studying the water in the garden in order to understand why the water in the garden was cleaner than other places, so that they could create more oases with drinking water to make it easier for their subjects to live in the desert.