Missing Parts: The Tantei Stories is the first installment in a trilogy of adventure games developed by FOG inc for the Sega Dreamcast. The game follows a young detective named Kyosuke Magami that works for the Narumi Detective Agency. The agency was founded by a former criminal that became a famous detective named Seiji Narumi. However, after Narumi's sudden disappearance, the agency was taken over by his daughter which leads to Magami joining the agency to help find her father as well as find the answers behind an old pendant belonging to his late parents.