When the five visit a private academy Kazama is attacked. He is left with reduced intelligence and strange bite marks.

One day, the Nohara family met a mysterious alien from outer space named Shiriri. On being basked by a ray emitted by Shiriri, Hiroshi and Misae became 25 years younger…

The Noharas get abducted by aliens who claim that Shin-chan’s baby sister is their princess! Will she stay on this planet or return to Kasukabe?