Is there an anime adaptation of this series?

Yes, the manga was adapted into a 74-episode anime series produced by Studio Madhouse, which is widely regarded by fans as a highly faithful, scene-for-scene adaptation of the original work.

Does this series have any supplemental reading material?

There is a companion novel titled Another Monster, which was released after the main series and provides a unique perspective on the events of the story through the eyes of a reporter.

Naoki Urasawa's Monster, Volume 16: Welcome Home

Manga Psychological Thriller

Pages: 230
Published: 2001
Language: English

Synopsis

Tenma is lying low, but his brief respite is doomed to be short-lived. Milan, one of Tenma's new friends, is planning to assassinate a man with deep ties to "Red Rose Mansion." Can Tenma dissuade him from this drastic line of action? Also, a seemingly unrelated string of murders by various serial killers hints at a sinister connection with Johan. How many more people need to die before the monster's work is complete?