Mizuhara Harue

Satsuki's classmate and friend. She calls her with the nickname "Satsukiinu" ("Satskin" in English).
After suggesting that Satsuki should ditch her religion for some free time, Harue ended up in a car accident and was then killed and kidnapped by the members of Tomb of Martuba, the secret society Satsuki had been a member of since her birth due to her extremist parents. She was then combined together with Satsuki through Spiritual Surgery.