Monster is a psychological thriller manga written and illustrated by Naoki Urasawa. The story revolves around Dr. Kenzo Tenma, a brilliant surgeon who saves the life of a young boy named Johan Liebert. However, Tenma soon discovers that Johan is a dangerous sociopath responsible for a series of murders. As Tenma tries to stop Johan's reign of terror, he becomes entangled in a web of conspiracy and must confront his own moral dilemmas. Monster delves into the darkest corners of the human psyche, exploring themes of identity, redemption, and the nature of evil.