Its Hiroko's birthday, and Hiroko isn't paying much attention to him. Hamtarou then went with the ham-hams to ham ham land. Hamtarou is searching for the magic sunflower seed, but, he will have to battle Maou-hamu for it.

Source: ANN

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Parent story: Tottoko Hamtarou
Sequel: Gekijouban Tottoko Hamtarou: Ham-Ham Hamuuja! Maboroshi no Princess