The comical escapades of the Kasukabe Defense Forces unfold in this adventure story centered around the theme of food. Shinnosuke and his friends Kazama-kun, Nene-chan, Masao-kun, and Bo-chan make the bold decision to attend the "B-class Gourmet Carnival" in Kasukabe without the watchful eyes of their parents, all in the hopes of indulging in the delicious yakisoba sauce cooked by the renowned "Sauce's Ken". Along the way, they encounter a mysterious woman who tasks them with delivering a legendary sauce to Sauce's Ken. But as they make their way to the event, an unexpected detour lands them in the hands of the nefarious "A-class Gourmet Organization", who are bent on eliminating all traces of B-class gourmet. Will the Kasukabe Defense Forces be able to safeguard the precious sauce and emerge victorious against their foes?