As an elite former assassin, Kamikawa Shun's world turns upside down after setting foot in Japan! Upon encountering a certain elementary school detective named Conan Edogawa, Shun facepalms, finally understanding the true nature of this world! This is a lighthearted and serious story about daily life in the world of Detective Conan. It includes mystery, plot twists, the Black Organization, case solving, and everyday life.