Nozomi, Masaru, and Mamoru go to buy snacks for their field trip, with 300 yen each as their budget, when Yoshiko tries to initiate them into the finer points of buying field trip snacks. Masaru and Mamoru follow Yoshiko's teachings as they buy their... (more) snacks, but Nozomi buys a single expensive snack. Nozomi's field trip will end dark and gloomy... or so they thought!