Blue(ブルー) is a manga by Kiriko Nananan that was serialized in the alternative manga magazine COMIC Are!; the tankōbon was released on April 24, 1997. The English version, published by Fanfare/Ponent Mon, was released on March 15, 2006. Blue is about two high school aged girls, Kayako Kirishima and Masami Endo, who find that their friendship is turning into something more, and they are unsure about their future and feel confused about their current life.