Harutora's childhood friend and the daughter of the main family of Tsuchimikado clan. She is a prodigal onmyouji attending school in Tokyo. During summer break, she comes to Harutora's town to interrupt his peaceful life by holding him to the promise he made long ago to become her familiar. She is heir to the Tsuchimikado family and is assumed to be the reincarnation of Yakou Tsuchimikado. As a family tradition, she has to present herself as male in front of other onmyoji families. She cares deeply about her family's reputation.
SpoilerShe cares about Harutora and has a crush on him since childhood. It was later on revealed that Hokuto was her familiar that she created in order to stay by Harutora's side.
In order to protect Harutora she was used to replace Harutora to be the heir of the main family of Tsuchimikado clan.