Action Mask’s ‘Action Stone’ has been robbed by Leotard Devil. Without the Action Stone, he can’t go to his world. So he chooses Shin-chan and his family to get back his stone through the Action Card numbered 99 (the most precious card in the whole set of choco chips.) According to the plan of Action Mask and Ririko, they make Shin-chan’s family to move to a beach so they can make them travel to the parallel world so they could help them to defeat the Leotard Devil (Higure Rakshas in India).
Next day, they get a message of Action Mask needs help to save the world from the other solar system’s clutch through news & newspaper. Half of the people of Japan, Saitama Prefecture, etc. were converted into Higure people through a beam that causes all humans to become Higures. Higure people were just going to attack the Nohara Family to convert them too into Higure people. Then Ririko arrives and saves them. The Nohara Family were thinking that a film shooting is going on, but Ririko is able to convince them that they are not in their own world. Dr. North Kasukabe kept the Action Stone out of the toilet in a wrapper of toffee which Shin-chan swallowed it during the absence of Dr. North Kasukabe and Ririco. (thinking it was a toffee).
The principal of Futaba Kindergarten came telling that Higure men are coming here and told run to the bus. Suddenly, Higure Man’s henchman Tea Pack Man comes to get the action stone but Shin-chan helps them to escape from him. Higure messages him and says to leave them. The bus was on the way, where Ume Matsuzaka (Shin-chan’s teacher) comes and gets all information about the Action Stone. Dr. North Kasukabe tells the Principal to get the bus to his secret place where they are supposedly safe. There, Madsuzaka reveals that she is a spy from the Higures. Then, the Rope Ladies and their team arrives (Higure’s trustworthy). Unfortunately, everyone gets attacked by the Higure beam but, Ririko, Misae and Shin-chan got away safely. Shin-chan arrived at Higure’s place after defeating the Rope Ladies and called Action Mask where they got a fight to save their worlds. As Shin-chan was having the Action Stone, he too was able to shoot the Action Beam. At last the war ended and the Higures went back to their solar system and Shin-chan and his family went to their own world. The story ends with a quarrel between Shin-chan and his mom.