X, also known as X/1999 and X: The Movie, is a 1996 anime film directed by Rintaro and studio Madhouse. Rintaro wrote it alongside Clamp head writer Nanase Ohkawa. It is based on Clamp's manga of the same name. It premiered August 3, 1996, in Japan and had a limited screening in North America during 2000. The supernatural thriller focuses on the roles Kamui Shiro, Kotori Monou, and Fuma Monou play in the Apocalypse. After his mother's death, the young Kamui returns to Tokyo to participate in a Holy War between two groups that will either protect mankind or protect nature at the cost of mankind.