Monster, written and illustrated by Naoki Urasawa, is a suspenseful black friday seinen manga series that delves into the depths of human nature. The story follows 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 later becomes a serial killer. Monster explores themes of morality, identity, and the consequences of one's actions, making it a compelling and thought-provoking read.