In a world where the Shinkansen is more than a train, a young girl's quest for her father's past intertwines with the destiny of a celestial lute, leading to a love story that transcends time and space....

In the wake of a mysterious disappearance, a young girl embarks on a perilous journey to uncover the truth behind her ancestor's lute, only to find herself entangled in a cosmic conspiracy that threatens the fabric of reality....