Follow the friendship between the Nobara family's pet dog Shiro and a "small dinosaur". Their connection helps the growth of Shinnosuke and the Kusakabe Defense Squad.
40-years ago, there was a prophecy claiming that in the year of “20” and “23”, two emitting lights would come to the Earth from outer space. And the dark light with strong power will bring out a huge disaster. In the summer of 2023, as predicted, two mysterious lights approach Japan and descend on Kasukabe. The white light hits Shin-chan, which makes him get a superpower. Meanwhile, a man called Mitsuru Hiriya, has been bathed in dark light and has acquired psychic powers begins to run amok. A man who wants the destruction of the world, Hiriya VS A happy-go-lucky kindergarten child, Shinnosuke. A superpower battle is going to begin!
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.
When the five visit a private academy, Kazama is attacked, and left with reduced intelligence and strange bite marks.