Off the coast of Japan, the environment has been ravaged with poisonous starfish-like creatures called Barem. Meanwhile, the Elias sisters, Moll and Lora, survey the destruction and enlist the help of three children, who had just discovered and befriended a strange little creature dubbed "Ghogo" to help find the mysterious treasure of Nirai Kanai, an ancient lost civilization, to save the Earth from the declining environment.