Monster Dr. Kenzo Tenma is a brilliant Japanese neurosurgeon who works at a top hospital in Germany. He is kind, ethical, and deeply committed to saving lives, often choosing patients based on need rather than status. After making a decision that changes his life, he becomes entangled in a dark pursuit involving guilt, responsibility, and a dangerous former patient. Throughout the story, he is driven by his strong moral code and his determination to correct a mistake that haunts him.