The Lospass: Official Guide Book (also called Flower, Sun, and Rain: Official Fan Book) is a book companion to the video game Flower, Sun, and Rain. Released on May 2, 2001, it is the first publication of this nature, followed by killer7's Hand in killer7 and Shadows of the DAMNED's KURAYAMI MAGAZINE. The magazine received a limited print through Sony Magazines, and has since become a rare collector's item. It acts as a physical replica of the Lospass Island guidebook Sumio Mondo uses in the game.

Community content is available under CC-BY-SA unless otherwise noted.