Anju Miyake is a character in the novel number9dream. She is the twin sister of Eiji Miyake and died nine years before the beginning of the novel, when Eiji was 11 years old. She has never known her father, and was abandoned by her mother. She and Eiji moved to Yakushima to live with their grandmother when they were X years old.

Although she is frequently referenced, Anju appears only in flashbacks.