Monster by Naoki Urasawa. It’s a psychological crime thriller set in late 20th century Germany. The story follows a surgeon who, years after saving the lives of a young boy and his sister, discovers that the boy was a murderer who has been continuing to kill. It’s really heavy and covers some of the political fallout of world war 2 and the cold war as it follows a really emotional character journey. Highly recommended for its serious tone, lack of juvenile tropes, and precise execution