The Detective Boys and Agasa go and watch a soccer game of the Tokyo Spirits vs. Noir Tokyo. On the way back they see a very rude and loud supporter who has gotten kicked out of many stadiums for his crazy behavior. They all get on a train to go home, but as they are exiting to change trains they see the rude supporter fall on the floor with a knife in his stomach. The train was packed so it could have been anybody and no one saw the crime happen, but Conan is able to reduce the suspects down to 3 soccer supporters.