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

When a mysterious stone carving bearing a striking resemblance to Sergeant Keroro arrives at the Hinata household, the Keroro Platoon embarks on an adventure to uncover its origins. Their investigation leads them to the enigmatic and remote Easter Island, a land steeped in ancient mystery.

There, they encounter the gentle, spiritual beings known as Mana and the peculiar twin siblings, Io and Rana. However, their discovery also stirs a slumbering threat—the legendary and malevolent spirit Akuaku, who has awoken after ages of sleep. The platoon must navigate this strange new world, forming unexpected alliances and facing a formidable ancient evil in a story that blends the anime's signature humor with high-stakes, island-spanning adventure.