Kogoro arrives in Okura, Fukuoka with Conan and Ran. Company president Fukamachi, his senior from his days as an MPD police officer, accidentally fell, and he's unconcious in the hospital. Managing director Kiriyama hires Kogoro to catch the culprit who graffitied the office. If Fukamachi is unable to return to work, Kiriyama will become the next president. Kiriyama believes Fukamachi's son Torahiko graffitied in the office in order to prevent that. Kogoro investigates the graffiti, but the possibility that Kiriyama pushed Fukamachi arises...

Kogoro is hired by three different clients to perform the same job: protect the racing horse White Spirits. Conan believes there's more to these requests than meets the eye. Later, Kogoro meets with company president and owner of the horse Tokuyoshi to explain the situation. After hearing his story, Tokuyoshi also hires Kogoro to perform the same job. The next day, White Spirits is transported by trailer to the track in order to race, but... when the trailer arrives, the horse that comes out of it is a different horse that looks a lot like White Spirits...