Monster, created by Naoki Urasawa, is a psychological thriller seinen manga that keeps readers on the edge of their seats. The story revolves around Dr. Kenzo Tenma, a brilliant surgeon who saves the life of a young boy named Johan, only to discover that Johan is a dangerous sociopath. As Tenma tries to unravel the mystery behind Johan's past and stop his reign of terror, he becomes entangled in a web of conspiracy and moral dilemmas. With its intricate plot, morally complex characters, and exploration of the nature of evil, Monster is a gripping and thought-provoking manga that will leave readers questioning their own humanity.