Plot:

In spring, Bubu City is holding a Class B food carnival. Shinnosuke was drooling over the delicious fried noodles and decided to take part in the food carnival with his friends from the Kasugabe Defence Force. On the way, a strange woman asked them for help and asked them to give a can of mysterious sauce to A Jian, who sells fried noodles at the food carnival.

Then the entrusted Kasugabe Defence Team took the wrong bus on the way to transport the cans, and encountered many obstacles on the way back. At this time, the B-class food carnival was also occupied by a group called A-class food organization, and the situation was critical. The enemy's obstruction, the collapse of friendship, Xiao Xin, can they break through the obstacles and send the sauce to the food carnival?

The so-called B-class cuisine refers to the quick, delicious and cheap common dishes such as fried rice, Osaka roast, Lamian Noodles, covered rice and curry. It is the source of tiny happiness belonging to the civilian class, and naturally has the widest mass base and support rate. However, such a good and cheap food is envied by the supreme ruler of A-level food institutions (voiced by Sukeyoshi Nakamura). At this moment, this evil guy is quietly carrying out the destruction plan for class B food.

On a sunny day, Nohara Shinsuke (voiced by Yajima Akiko) and friends from Kasugabe participated in the Class B Food Festival. On the way, they were entrusted by a mysterious person to send a jar of sauce to the food festival. When the special task came, the partners of the Chunbu Defence Force went out hand in hand.

However, Xiao Xin didn't know that it was an important seasoning for B-class food. Around the last treasure of this jar, a series of battles were launched between the defense group and the A-level food institutions. For the happiness of all ordinary people, Xiao Xin! Come on!