One day, Hamtaro has a dream in which a certain hamster asks him for help. This is because he learned the incantation of his homeland, "Ham Ham Ham-ja!", taught to him by Deppa. The Ham-Hams ride a magic carpet and head to the Hamster Kingdom, "Ham-ja Kingdom". However, the desert cat "Sabaku-nya", who was once sealed away for causing mischief, has taken over the kingdom and is plotting to make the kingdom's princess, Princess Shela, his bride. Will the Ham-Hams be able to defeat Sabaku-nya and save Princess Shela?