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The story depicts a woman named Pizou In hiding, who brings a 5-year-old boy to the home of Nobita and Shizuka. She tells them that she is the biological mother of Nobita and Shizuka's 5-year-old son, Shinosuke. That night, the Nobi family is attacked by a mysterious ninja group, and Shinosuke is kidnapped. The Pizou In family is the origin of ninjas, a lineage that has guarded the Earth's energy, "Ninterru," for generations. Thus, the fate of the Earth is entrusted to Shinosuke's ninja techniques.