The Detective Boys attend a promotional event where the J. League play soccer with children where the group are acquainted with the people there. The next day, the Detective Boys watch the soccer match at Touto Stadium. Kogoro Mori receives a phone call from a bomber who supplies the location of a bomb in the form of a riddle. The riddle reads "Blue zebra and blue boy, rain from above, people from below, their left hand, as it is shows, the tree on the left. Ran Mori relays the riddle to Shinichi Kudo allowing Conan to decipher it. The blue zebra and boy refer to the mascots of the teams currently playing at Touto stadium. The rest of the riddle is a play on kanji; The top part of Rain (?), bottom part of People (?), left of Hand (?), Show (?) as it is, and the left of Tree (?). Filling in the missing parts of the kanji and adding them together in order forms the word Electronic Scoreboard (?). With little time to evacuate the spectators, Conan traverses up the infrastructure and arranges the explosives so the scoreboard in the opposite direction of the people.