If you could transform every memory into a melody, what would it sound like? While excelling academically and managing the household singlehandedly while her mother was away, Asuna Watase found solace only in her antique crystal radio hidden in a secluded mountain cabin. One afternoon she inadvertently tuned into an eerie, wistful tune unlike any she had previously encountered. Shortly thereafter, a mysterious youth named Shun rescued her from a perilous beast, inadvertently setting Asuna on an extended odyssey toward a forgotten realm that would eclipse her wildest dreams, turning her once simple rhythm into a complex lament for all eternity of the ages ever.