Mitsuba has been with the Vampire Extermination Unit since she was 13 years old. After an incident she caused that killed a member of her previous squad because of her selfishness, she has since then focuses on teamwork in battles. It is implied that she may have a crush on Yuichiro. Her Demon Weapon is Tenjiryu a manifestation-type demon weapon which takes the form of a giant battle axe.