Keroro Gunsou Movie 5: Tanjou! Kyuukyoku Keroro, Kiseki no Jikuu-jima, de arimasu!!

A stone carving resembling Keroro appears at Fuyumi's home, prompting the Keroro Squad to investigate. They journey to Easter Island, where they encounter friendly spirits called Mana and the peculiar twin siblings Io and Rana. They also face Akuaku, a powerful malevolent spirit that has just been awakened after a long period of dormancy.