Detective Conan, Boku dake ga Inai Machi Recommendations
Both have a main protagonist who returns to his child but retain their full intelligence and have to solve a murder case. While Detective Conan Is episodic, Boku dake ga Inai Machi centers only around a few murders. Both have to try to hide their real identity for others. Boku Dake has an overal darker atmosphere than Detective Conan.