Sayo Ikaruga

She is Shimon's non-blood related sister who is 11 years old. She is a vessel for holding a powerful enchanted guardian called Kuzunoha and its 48 escort guardian. It's revealed that her life is very short and she can be alive only up to the age of 20 or less. When she summons the powers of Kuzunoha, it is shown that she coughs up blood as a indication of her lifespan decreasing every time she uses its power. She is shown to be in love with Rokuro and thinks him of as a prince for her who saved her from loneliness. In chapter 21 and 22, she confirms from ceremony of divination that Rokuro is whether a successor or reincarnation of Abe no Seimei—the first of the exorcists and one of the strongest of all times in history in exorcising impurities.