Youji, Kei, Kelly, and the small bear-shaped robot Oscar are little heroes who must save the town. It is Youji's birthday today, but this does not appear to excite him. Whether they know this or not, Kei, Kelly, and Anna, the woman who raised him as her own, seem to be planning something. That is when an out-of-control sightseeing airship appears over the city. Our little heroes must face their biggest challenge yet! The action-packed drama even features an evolved Fastening Machine! Will our heroes be able to fasten the town's future? What will happen to Youji's birthday? There is only one way to find out!