Shin Chan, surnom de Shinnosuke Nohara, est un petit garçon de 5 ans. Turbulent et mal élevé, il n'arrête pas de faire des bêtises malgré les remontrances de sa mère Mitsy (pour la version française) qui s'occupe seule de lui pendant la journée. Son père Harry rentrant assez tard du travail. La série nous raconte donc les mini-aventures de Shin Chan, entouré de ses amis et de son chien.

The story begins when toys of Oban, a character from a tokusatsu (special effects) television show, becomes popular, but also loses popularity quickly. Many unsold Oban toys are thrown away. A bolt of lightning strikes one of these toys one day, and gives it life. Alongside other toys thrown away by people, Oban swears revenge on humans, and attacks. At the same time, Oban's sworn enemy Chuukounen Kamen is also given life. Chuukounen Kamen, normally a middle-aged, overweight, and depressed man, powers up by eating cup noodles. Alongside Shinnosuke, he will fight to reclaim peace for the world. Source : ANN