She reveals herself in chapter 9, before that she had her face hidden beneath a hooded sweater and was known as Yamada. The only information received in the manga so far is that she is an upper first class exorcist and a senior inspector. She was dispatched by the True Cross Vatican Headquarters to investigate the Japanese Branch's "risk factor". 2 years before Rin was born, she was Fujimoto Shirou's student. She claims to be 18, but in chapter 11 Yukio said that she already turned 26, and she seems sensitive about her age, as she threw a beer can at him claiming 'her hand slipped' shortly after
