Fastening Days 2

In the previous story, Yoji and Kei rescued Anna, their adoptive mother. Now, they're once again using the Fastening Machine now 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 se appear? Just then, a big problem hits this peacefultown! Will these small heroes be able to save the town from the crisis?