Monster, written and illustrated by Naoki Urasawa, is a psychological thriller manga series that delves into the darkest corners of the human psyche. The story centers around Dr. Kenzo Tenma, a brilliant surgeon who becomes entangled in a web of conspiracy and murder after saving the life of a young boy who turns out to be a dangerous psychopath. As Tenma tries to unravel the truth behind the boy's past and the mysterious organization known as 'Monster,' he is forced to confront his own morality and the blurred lines between good and evil. Monster is praised for its intricate plot, well-developed characters, and thought-provoking exploration of human nature.