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Laura and Kana are going to an amusement park with Laura's parents, and Hamtaro, Oxnard, Boss & Bijou have snuck aboard. Everyone in town is there, as a magazine gave out free tickets. Howdy & Dexter are performing as a comedy duo, which attracts the attention of 2 girls, Eri and Yuri. The Ham-Hams make friends with the girls and give them a balloon, which floats away. The girls chase after the balloon, getting farther away from their parents, who are looking for them. The Ham-Hams tell them their parents are looking for them, but they want to get the balloon, which is stuck on the track of a roller coaster. The Ham-Hams say there's no way to get the balloon on the track, but the girls won't go find their parents without it. The boy Ham-Hams climb the roller coaster to get the balloon. Hamtaro manages to get the balloon, and nearly gets hit by the coaster train. But by then, Eri and Yuri had already forgotten about the balloon and gotten on the merry-go-round. The girls tell the Ham-Hams to join them on another ride, and Hamtaro accidentally lets go of the balloon. Meanwhile, Laura, Kana and Laura's parents are waiting in line for a teacup ride when they too notice Eri and Yuri's parents looking for their daughters. Eri and Yuri are coincidentally trying to get on the same ride themselves, and cut in line to get on, despite the Ham-Hams telling them their parents are nearby. The boy Ham-Hams climb on to try and get them to go to their parents, but the ride starts, making the Ham-Hams dizzy. The girls are about to take the Ham-Hams on the ride again when they are kidnapped by a masked stranger. Maxwell suggests that it's Dracula, scaring the Ham-Hams. By the time the Ham-Hams come to, the girls are gone. The Ham-Hams go to a haunted house attraction, where they think the girls are being held. Despite being afraid, the Ham-Hams go inside the house. Inside, the Ham-Hams get scared and run out a door, which leads them right outside where the girls are being held. It turns out that it isn't really Dracula, but an employee of the park who took the girls to a lost & found. The Ham-Hams do not realize this and after hearing the employee tell the girls' parents to pick them up by the demon door (really the door of the lost & found), they try to get the girls to follow them so they don't get taken to the demons. The girls don't realize the Ham-Hams think they're about to be given to demons, and follow them. Eri and Yuri's parents go to the lost & found to pick them up, only to find that they've once again ran off. While running off, the girls run into Laura and Kana. The girls and the Ham-Hams run to a fountain, and the Ham-Hams think they've saved the girls. Hamtaro still wants to return the kids to their parents, but the other Ham-Hams want to play more. The girls are hungry however, and start crying for their parents. Meanwhile, Laura and Kana notice the girl's parents still haven't found them. Eri & Yuri's father gives a description of the girls, and Laura and Kana realize the girls they ran into earlier are the girls they're looking for. Back with the Ham-Hams, the girls are still crying, despite the efforts by the Ham-Hams to cheer them up. Hamtaro notices Laura and Kana leading the girl's parents to where they last saw them, and tries to lead Laura to where they are. He ties a microphone to himself and puts it up to the girls crying. This alerts the parents, who are finally reunited with their daughters. The girls say goodbye to the Ham-Hams, and say they hope they will play again some day.
