Kotaro Tomoe is a third-year student at Kishimai High School and a member of the Go-Home Club. Kotaro is a headstrong boy who can sometimes be very stubborn. He is considered the heart of the group, as he is sometimes the only person who can keep the group together. While he may talk like a delinquent or like he's looking for trouble, Kotaro cares a lot about his fellow club members and shows concern for their wellbeing. Kotaro also has a strong sense of right and wrong, and could be considered to have a hero complex. His fascination with justice and saving people is related to his wish and reason for coming to Mobius.