Nenene Sumiregawa

A prodigy novelist in her high school years, usually referred to as sensei and originally featured in the Read or Die manga as a teenage friend of the older Yomiko. She is often frustrated with Yomiko's obsession with books -- and later the Paper Sisters when they move into her home -- and chides her for being absentminded, leaving post-its in her room. Due to Yomiko's disappearance, she has become very self-sufficient but unfortunately wistful and bitter at times. She remained in Japan, despite her parents' wishes, in order to housekeep and tend to Yomiko's personal effects until her (presumed) return.

Along with two other characters within the series, many fans argue Nenene's dedication to Yomiko borders on the romantic, and the series has a strong yuri fandom.