Is there an anime version of this story?

A 74-episode anime adaptation produced by Studio Madhouse exists and is widely considered a faithful, scene-for-scene translation of the original manga.

Are there any other books related to this series?

A supplemental novel titled Another Monster was published in 2002, which provides additional details and perspectives on the events of the main story through the lens of an investigative report.

Naoki Urasawa's Monster, Volume 9: A Nameless Monster

A Nameless Monster

Manga Crime Psychological Thriller

Pages: 208
Published: 1998
Language: English

Synopsis

When an unusual children's book causes a disturbing reaction in Johan, it may provide an ideal opportunity for Tenma to fire a well-aimed sniper shot. Could this curious book created by an obscure Czech writer also be the key to unlocking more secrets of Johan's enigmatic past?