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 takes him away to a Ninja Village. In the Ninja Village, the Hesogakure family has been protecting "the earth's navel" by blocking it with a pure gold stopper using the "Mononoke technique" that has been passed down from generation. If it comes off, the earth will wither, the rotation will stop, and the "tomorrow" of the world will be lost! It is up to Shinnosuke to reveal the mystery of his birth and protect the future of the earth and the "tomorrow" of his family.
Hiroshi and Misae have never been to a honeymoon trip to a foreign country. One day, Misae discovered an inexpensive and family-friendly holiday package to Australia and the Nohara family decided to make it their first honeymoon vacation. Hiroshi gets kidnapped upon arrival to Australia, leaving Shinnosuke, Misae and others on a dangerous journey. It turns out that Hiroshi is the key to a secret treasure. The remaining members of the Nohara Family must rescue Hiroshi, while a mysterious masked man and treasure hunters from all over the world are after him. The struggle is among three different groups in this action-filled treasure hunting adventure.
12-year-old Oriko Seki, who lost her parents in a car accident, ended up living in her grandmother's Onsen Ryokan "Haru no Ya." With the ghost "Uribou" cohabitating with her and all the other odds, she ended up training to be a young female innkeeper. At first, she didn't like the training, but gradually felt her admiration for her title and began to train seriously. Thus, the growth of the young warrior Oriko begins.
One night, the Nohara family were enjoying a pleasant dream, when suddenly a big fish appeared in their dreams and ate them. The next morning, Hiroshi read in the newspaper that everybody in another town had the same nightmare as him, but it seemed to have ended. But Hiroshi also heard the same dream from Misae, Shinnosuke, Himawari and even Shiro. They were surprised and thought if the same thing is happening in Kasukabe too. In kindergarten, on telling others about his nightmare, Shinnosuke was surprised to know that everybody too had the same dream. Then a mysterious girl named Saki was transferred to Futaba Kindergarten and joined Shinnosuke's class. Everyone in the class, including the rather inactive Bo-chan, were all excited and happy on seeing her. But Saki had a cold attitude and didn't get along well.
Shin-chan must rescue the adults of Kasukabe when they mysteriously abandon their responsibilities to relive their youth at the new 20th-century expo.
After a nuclear holocaust tears the world apart, mankind is forced to the harshness of not only the oppression of others who are much more powerful, but the dead earth which seems to be getting worse with every passing moment. But a savior has risen from the ashes, a man who will defeat those who would torment the weak and make the world a livable place once more. A man named Kenshiro...