High school student Aoi Aioi lives with her elder sister, Akane, after a tragic accident took their parents away 13 years ago. Because Akane has since been taking care of her single-handedly, Aoi wants to move to Tokyo after her graduation to relieve her sister’s burden and pursue a musical career, inspired by Akane’s ex-boyfriend Shinnosuke “Shinno” Kanamuro. Shinno was part of a band until he left for Tokyo to become a professional guitarist after the sisters’ parents passed away, and he was never to be seen again.
One afternoon, while Aoi practices her bass in a guest house, she gets startled by the 18-year-old version of Shinno from 13 years ago! As if by coincidence, the current 31-year-old Shinno also returns to the town, but he has changed drastically. There are now two Shinno’s in existence, but why is the Shinno from the past present?