Tabane is Houki's older sister, the creator of IS and a close friend of Chifuyu. Much to everybody's surprise, Tabane is a very energetic person and runs around like a happy child. She often refers herself as "Tabane the Genius", hinting to a sense of cockiness. She is very fond of the people she loves and would hug them as many times as she feels like. She states that there are only three people in the world that have any meaning to her (Houki, Chifuyu, and Ichika) and the rest of the humans are the same to her (she can't identify one human from another). [From IS Wiki]