He is known as Aya, the name that belongs to his sister who is in a mysterious coma. His parents were killed and his sister run over by Reiji Takatori. As a constant reminder of the purpose behind his actions, he takes on his sister's name and wears one of her earrings, which were actually a gift from him to her. Because of his past tragedy and current resolve, he is terse and seems very cold. His real name is Ran Fujimiya. He carries a katana and is very skilled with the sword.
Source from Wikipeida