One day, a woman named Chiyome Hesogakure with a child named Chinzō visits the Nohara family and claims that she is the real mother of Shinnosuke and she claims Shinnosuke & replaces him with her son Chinzo & takes him to a
Ninja Village. Here the Hesogakure family has been protecting "
the earth's navel" by blocking it with a pure gold stopper using the "Mononoke Ninja technique" that has been passed down from generation to generation. If it comes off, the earth will wither, the
rotation will stop, and the "tomorrow" of the world will be lost! But prolonged use of the technique causes its wielders to be permanently transformed into
anthropomorphised animals. This caused Chinzo's grandfather to become a
sloth & his father to become a
gorilla. Chiyome, who was pregnant with her second child, fears that her children too will be coerced into overusing the Ninja technique by the headman of the Ninjas & transform into animals like their father, now that the gold stopper was gradually coming out. So she replaced Chinzo with Shinnosuke, as both were born on the same day at the same hospital, with Chiyoma & Shinnosuke's mother Misae being in the same ward. On hearing the real events from Chinzo, Shin-chan's parents travel to the Ninja Village, but the greedy Ninja headman (who wanted to profit from the gold) put obstacles on their path. Finally when the gold stopper comes out, Shin chan & his friends master the Mononoke Ninja technique & put back the gold stopper in its place & Chiyome delivers her second child. == Cast ==