One day, a stone carving bearing an uncanny likeness to Keroro arrives at Fuyumi's place. To solve this mystery, the Keroro Squad travels to the isolated and mysterious Easter Island. There, they meet harmless spirits known as Mana, and the odd twins Io and Rana. Lastly, there is Akuaku, a legendary evil spirit recently awoken from its long sleep.

~ translated and adapted from official site by Cranston

Note: Shown as a double-feature with the Chou Denei-ban SD Gundam Sangokuden Brave Battle Warriors movie.

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Parent story: Keroro Gunsou