Yasutaka Tsutsui
is a 1993 techno-thriller novel written by Yasutaka Tsutsui. It first appeared in Marie Claire magazine in four parts, each appearing chronologically in the January 1991, March 1992, August 1992, and June 1993 issues. A manga adaption of the novel was created by Reiji Hagiwara in 1995 but was not published until 2003. The novel was adapted as an animated film in 2006, which was itself adapted into a second manga the following year by Eri Sakai. The novel was translated into English by Andrew Driver, was published by Alma Books in April 2009.