Haruka Nijo is a second-year highschool student. She's the older twin sister of Kanata Nijo and a vocalist of the band εpsilonΦ as well as its guitarist. Haruka regards most everything except music with apathy and does not say much when in the company of others. When she does, she speaks with aggressive, often rude language, rarely calling people by their names and not bothering with honorifics. She dislikes loud people, prefers to keep to herself, won't hesitate to tell someone to shut up.