Join the Kasukabe Defense Forces, led by Shinnosuke and his friends Kazama, Nene, Masao, and Bo, on a comical adventure centered around the theme of 'food'. When they decide to sneak off to the 'B-class Gourmet Carnival' in Kasukabe without their parents, their main goal is to devour the delectable yakisoba sauce prepared by the renowned 'Sauce's Ken'. However, their plans take a twist when a mysterious woman entrusts them with a legendary sauce destined for Sauce's Ken. As they make their way to the event, they find themselves lost in the mountains, pursued by the 'A-class Gourmet Organization'—a group with sinister intentions to eradicate B-class delicacies. Will the Kasukabe Defense Forces safeguard the precious sauce against this gourmet conspiracy?