A fourth-grader investigates the mysterious reason behind the sudden appearance of penguins in his village, which is somehow related to a power from a young woman working at a dental clinic.

In the previous story, Yoji and Kei rescued Anna, their adoptive mother. Now, they are once again using the Fastening Machine with Oscar, the bear robot, to solve any problems the town is facing. One day, however, a mysterious hero makes her appearance. And she happens to have the same Fastening Machine as Yoji and Kei. Who is this she? Why did she appear? Just then, a big problem hits this peaceful town! Will these small heroes be able to save the town from a crisis? This is a near-futuristic action anime taken to the next level! Don't miss it!

The theatrical episode will cover events from the fifth volume of the manga.