The story centers on Asuna, a girl who spends her solitary days listening to the mysterious music emanating from the crystal radio she received from her father as a memento. However, she embarks on a journey of adventure to meet a boy again, and thus comes to know the cruelty and beauty of the world, as well as loss.

Strange sounds in the darkness... Unearthly music from an old crystal radio... These are all the warning Asuna Watase has before a simple walk to her clubhouse catapults her into a nightmarish adventure that will take her beneath the Earth to a lost land beyond the realm of legend! Attacked by a strange monstrous creature, rescued by a mysterious stranger and pursued by a relentless enemy, Asuna finds herself enmeshed in a centuries old mystery that will bind her to a strange young defender and lead her inevitably, towards a secret that may hold the key to life itself! <br><br>
(Source: Sentai Filmworks) 

A young man named Shin lives with his big brother Shun in an underground place named Agartha. One day, his brother left toward the surface with a cristal and Shin has to follow him and bring back the cristal to Agartha.<br><br>
During his journey, he will meet Asuna, a young girl who lives without her father and Morisaki, a man who has lost his wife.

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