Kyuu, Megu, and Kinta enter the Entrance exam to DDS. A photograph is shown before it is declared that the test is to deduce and follow the culprit of a murder case, where the only clue is the photograph shown moments ago, which was taken by the victim. As Kyu, Megu and Kinta use their skills to deduce the culprit, and follow him to the second exam location, they are joined by Kazuma. Another hopeful, Saburömaru, who knew Megu from Tokyo National Talent Development Research Center, follows them, thinking it is easier than deducing himself.