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

A mysterious stone carving that looks exactly like Keroro arrives at Fuyuki's home, sending the Keroro Platoon and the Hinata siblings to Easter Island in search of an explanation. There they meet the twins Io and Rana, gentle spirits known as Mana, and legends surrounding an ancient being called Akuaku.

When Akuaku awakens, the island's strange power becomes a threat that the visitors cannot ignore. The platoon is forced into a battle involving ancient mysteries, time and space, and an enemy capable of turning Keroro himself into something far more dangerous than his usual incompetent invader.