Fan Casting Monster

Monster (stylized in all caps) is a Japanese manga series written and illustrated by Naoki Urasawa. It was published by Shogakukan in its seinen manga magazine Big Comic Original between December 1994 and December 2001, with its chapters collected in 18 tankōbon volumes. The story revolves around Kenzo Tenma, a Japanese surgeon living in Düsseldorf, Germany whose life enters turmoil after he gets himself involved with Johan Liebert, one of his former patients, who is revealed to be a psychopathic serial killer.