Hideki is facing his first practice exam and goes to the book store to buy an English dictionary after realizing he forgot his own at his parents' house. At the store, Chi finds a picture book "A City with No People" which sparked Chi's curiosity. Hidki buys it for her rather than his dictionary, and Shinbo lends his to Hideki. While Shinbo is teaching Hideki how to use the dictionary, Chi finishes the picture book and something unusual happens.