X/1999, Volume 01: Prelude - CLAMP CLAMP's X/1999 is not for the faint of heart or people who do not understand how to properly read manga and breeze through the panels without truly reading the characters expressions, the symbology and understanding the rich dialogue. Do not for a minute think this is a book for young teens, this manga reads like an adult book.Considered one of CLAMP's best work this manga truly delivers, dark, gritty and romantic at times X is the story of a world descending into an Apocalypse. Reference to the Revelations from the Bible abound and symbology presented in its pages are there to enrich the story.With complex characters, intricate story lines and a plot that leaves you dizzy X is truly the cream of the crop when it comes to manga.