Introduction by Jonathan Clements.
High school student Aoi Aioi lives with her sister Akane, after a tragic accident led to the death of their parents many years previously. Aoi is desperate to move to Tokyo after her graduation to pursue a musical career, a decision seemingly solely inspired by Akane's ex-boyfriend Shinnosuke "Shinno" Kanamuro, who left for Tokyo to become a professional guitarist and was never seen again.
While Aoi practices the bass one afternoon, she is shocked by the appearance of what seems to a younger version of Shinno... right in time to coincide with the return of the actual Shinno, who is very different from the boy Aoi remembers. Why has this Shinno returned, and what can be gleaned from his seemingly ethereal younger counterpart?