Kôkôsei burai hikae

Something sinister's afoot in Kasukabe. Shin-chan doesn't know what it is, but he's pretty sure it involves samba-dancing doppelgängers.

In an era where aliens have invaded and taken over feudal Tokyo, a young samurai finds work however he can.

Everyone's favorite TV superhero Action Mask shows up in Kasukabe, and he's trying to get something from Shin-chan -- but what could it be?

The Noharas go on an Action Mask-themed cruise, where all the grown-ups get kidnapped by a gang of monkeys. It's up to the kids to rescue them!