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](https://anilist.co/character/24482/Okumura-Rin) was born, she was [Fujimoto Shirou](https://anilist.co/character/30431/Fujimoto-Shirou)'s student. She claims to be 18, but in chapter 11 [Yukio](https://anilist.co/character/24734/Okumura-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
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