Children Who Chase Lost Voices From Deep Below

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. During his journey, he will meet Asuna, a young girl who lives without her father and Morisaki, a man who has lost his wife.

Asuna is a shy and diffident girl who lives in the mountain town of Mizunofuchi. One day, she meets Shun, a boy who claims to be from a mythical land known as Agartha. However, just as a bond is beginning to form between them, Shun vanishes. As Asuna wishes she could see him again, she encountersShin, another boy who looks just like Shun, and Morisaki, a teacher searching for Agartha. The three of them set out for the legendary country, each with their own goal in mind—and their own lessons to learn along the way.