Comical adventure story starring Kasukabe Defense Forces and dealing with "food" as theme. Kasukabe Defense Forces (Shinnosuke and his mates: Kazama-kun, Nene-chan, Masao-kun and Bo-chan) decide to attend "B-class Gourmet Carnival", a big event in Kasukabe, without their parents, to eat very tasty yakisoba sauce cooked by "Sauce's Ken". On the way, a mystery woman asks them to bring a legendary sauce to Sauce's Ken....