Kaena: The Prophecy (2003)

Axis, a gigantic coiling plant, stretches high above the clouds. At its center, is a village whose people are in mortal danger, because Axis is withering, it's sap is drying up. The people beg their gods for help, but to no avail. Compelled by a mysterious force, Kaena, a rebellious, high-spirited teenage girl, will defy the High Priest and her people's ancestral beliefs, to take the perilous journey through the Axis and discover what dark secrets lie beyond the clouds. A dying world, an evil force, a terrible secret.