Well-known high school detective ~ Shinichi, after compelled to consume poison by a secret society, this detective shrink suddenly. Before investigating the real motive of the society and restore his original form, he replaced his name with "Edogawa Conan", concealing his real identity. Now, solely one odd scientist, Agasa knows Conan's secret. With this scientist assistant, Conan remains at his girlfriend house, Ran, which is the Mouri Detective Center ~ as a primary school student. Yet, Mouri Detective Center's manager is a simple-minded and insignificant person, Conan has to escort him to solve lots of complex case. At the same time, he tracks the secret society. Because Conan is fond of investigation, he hope his identity will not be cognizant by Ran.