Kogoro arrives in Okura, Fukuoka with Conan and Ran. Kogoro's senior and company president Fukamachi accidentally fell and is unconscious in the hospital. Managing director Kiriyama hires Kogoro to catch the culprit who graffitied the office. Meanwhile, Ran meets suspected vandal and Fukamachi's son Torahiko. Torahiko insists he didn't do it and is conducting his own investigation into who pushed Fukamachi. Eager to solve the case, Kogoro gathers everyone involved including Torahiko at the office and begins explaining his reasoning, but...