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.
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.
Mari Mashiba (真柴 摩利, Mashiba Mari, November 21, 1959) is a Japanese voice actress from Gunma Prefecture. She is affiliated with Production Baobab. Her real name is Mariko Sugiura (杉浦 真理子). Her best-known role is voice acting a major character from Crayon Shin-Chan, Tōru Kazama.