The film opens with Shaymin as Dialga appears. Then, in the Reverse or Distortion World Giratina senses Dialga's presence, and flies up to the Real World to capture him. Dialga drinks, just as Giratina's portal opens up. Giratina then drags Dialga into the Reverse World. Shaymin is also catapulted into the Reverse World. As Dialga and Giratina fight, Zero observes the battle in his ship. Shaymin absorbs a dark gas and uses "Seed Flare," tearing a hole in the Reverse World and escaping. Dialga fires a laser at Giratina, enveloping her in a time loop and trapping her in the Reverse World. As Dialga escapes, Shaymin falls into a river.

Shin Chan gets his mother to finally buy him the last Ultra Hero sword, but when he opens the package there is only one rule inside. In addition to this confusion, Shin Chan meets Tostado, a dog just like Nevado but in black.

It is the 13th film based on the popular comedy manga and anime series Crayon Shin-chan. The film was released to theatres on April 16, 2005 in Japan.

Action Kamen comes to Shinchan's world seeking help from Shinchan to defeat the Haigure Demon. Then the adventure of Shinchan and his family begins.