Crayon Shin-chan Movie 30: Mononoke Ninja Chinpuuden

A woman named Chiyome appears before the Nohara family claiming that Shinnosuke is actually her son and that two babies were switched at birth. Before Misae and Hiroshi can make sense of it, Shin-chan and Chiyome are taken away by a mysterious ninja group to a hidden village, where the secret of his birth becomes tied to an old clan and a duty far larger than one family.

The Mononoke ninjas guard the "Navel of the Earth," an enormous opening sealed by a plug of pure gold. If that seal is removed, the planet itself could be thrown into disaster. Shin-chan suddenly finds himself surrounded by ninja techniques, inherited responsibilities, and a plot threatening the world, while the Noharas refuse to let their most troublesome family member disappear without a fight.