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 (雨?), bottom part of People (人?), left of Hand (手?), Show (示?) as it is, and the left of Tree (木?). Filling in the missing parts of the kanji and adding them together in order forms the word Electronic Scoreboard (電光現示板?). 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.

The Tokyo Metropolitan Police Department work with Kogoro to find out the bomber's identity. Conan reveals the bomber revealed information only the people they acquainted with during the promotion event should know, limiting the suspects down to five. Kogoro receives a letter from the bomber stating a larger crowd will witness the next bombing and a second letter will arrive later to reveal the location of the next bomb. The police speculate Shiodome Arena is the next target as it is the closest event with the largest attending audience. The second letter arrives and reveals the J. League All-Star Soccer is the next target as it has the highest viewership. The letter declares in all ten simultaneous games, the strikers must use the following play hidden in the letter against the home team to stop the bomb and challenges Kogoro to beat him as the eleventh striker. Conan reveals the boarder and the staple matches a association football pitch and the kanji written in red is written in a way so that the staple has red markings on top of it; He deduces the bomber wants the strikers to kick the ball in the center of the goal post. As per the letter, the police are only able to alert the coaches and the strikers in each game about the bombs.

While the strikers in all ten matches successfully hit the goal post to deactivate the bombs, the police visit Keiichirō Motoura who they believe has a strong motive to be the bomber. Motoura confesses he holds hatred towards Kogoro and fans of the J. League All-Star Soccer games since they stalled the ambulance his dying son, Tomofumi Motoura, was in and blamed them for his death. Kogoro reveals the group mistakenly believed the ambulance they called was for a collapsed elder and attempted to charter the ambulance to their direction. Motoura however reveals he is not the bomber. Conan investigates after watching a video of Tomofumi playing soccer, realizes Kazumasa Nakaoka is the culprit. Conan then leaves to Touto stadium to confront Nakaoka.

There, Nakaoka reveals his brotherly relationship with Tomofumi and how he also believed Kogoro and the J. League All-Star Soccer fans were the cause of Tomofumi's death. Nakaoka then reveals that the eleventh switch to stop the bombs are on the goal post; However the detonations have began. Conan attempts to kick the ball to the goal post but is blocked by falling debris. The Detective Boys give Conan a second ball allowing him to make the shot and stop the explosions.