Is there an anime adaptation of this series?

A faithful 74-episode anime adaptation produced by studio Madhouse exists, which covers the entire story of the manga with high precision.

Does this story have any sequels or related books?

There is a supplemental light novel titled Another Monster that provides additional details and context not found in the original manga series.

Are there any real-world influences behind the story?

The narrative is grounded in the historical context of post-reunification Germany and incorporates real-world locations, sometimes by superimposing photographs with the author's illustrations to enhance its realistic atmosphere.

Naoki Urasawa's Monster, Volume 15: The Door to Memories

Manga Crime Psychological Thriller

Pages: 208
Published: 2000
Language: English

Synopsis

Dangerous men of influence hoping to exploit Johan's frightening min for their own shadowy purposes are also hot on the "monster's" trail, and they're willing to use Eva, Tenma's ex-fiancée, to identify him. But what will happen to Eva when her assistance is no longer required? Will her only chance for salvation rest on the shoulders of the very man who's been hired to kill her?!