Shintaro realizes he accidentally pocketed Furuhata's wallet instead of his own. His curiosity gets the better of him and he opens it finding unexpected items inside.
Kuwabara teaches Shintaro a trick to help him always win at quizzes. Shintaro immediately phones Furuhata to try to catch him out but Furuhata isn't easy to trick.
Shintaro returns from New York and is thrilled to show his friend Kuwabara all the new things he's learned. But what's hiding in the large cardboard box delivered to the lab?
Shintaro is despondent because he thinks Furuhata does not treat him as a human being. Kuwabara and Haga try to raise his spirit through the medium of song.
After they leave Furuhata looking for his passport in a South American country, Shintaro and Saionji try to watch a movie on a plane in Spanish. The trouble is, neither of them understands the language.