Yami to Boushi to Hon no Tabibito

is a Japanese eroge visual novel published by Root in December 20, 2002.

An anime series based on the game with a different storyline was produced by Studio Deen and premiered on JNN-related networks (TBS and MBS) from October to December 2003.

Plot
The game begins with a girl who is taken to a strange, magical realm by a dragon. She apparently was taken to the library where all past, present, and future realities are kept within the books. The player is a young man who has come from one of these books as well, but has forgotten his way back home. The player is commissioned to find the missing girl by the denizens of the library, and starts his search by entering different books.