The film centers on Asuna, a girl who invests her singular days listening to the strange music rising from the crystal radio she obtained from her late dad as a token. Someday while walking home she is assaulted by a terrifying beast and conserved strange young boy named Shun. Nevertheless, Shun vanishes and also Asuna start a trip of adventure to the land of Agartha with her instructor Mr. Morisaki to satisfy a Shun once more. Via her trip she familiarizes the viciousness and also beauty of the globe, as well as loss.