Chihaya Ikaruga

Chihaya is a 15-year-old, 3rd year junior high school student and the second youngest (and most sexually frank) of the Ikaruga family. She is also a professional mangaka who uses her siblings and Yoichi Karasuma as a basis for her manga by manipulating events to bring about satisfying resolutions. She also seems the most knowledgeable about relationships out of the sisters as she flirts with Yoichi while poking fun at the others. She is the only person in the Ikaruga family to wear glasses.