Balancing her academic excellence and household responsibilities in her mother's absence, Asuna Watase finds solace in her secluded mountain retreat, where she indulges in her vintage crystal radio. Unexpectedly stumbling upon a haunting tune one day, Asuna's world transforms when a cryptic boy named Shun rescues her from peril, propelling her into a fantastical realm that defies all she's ever known. In this enchanting odyssey, Asuna's harmonious existence evolves into a complex symphony of discovery and mystery.