Rogetsu Kagura is a festival held once every ten years on Rogetsu Isle in southern Japan.
During the festival, five girls mysteriously disappeared. The girls were rescued by a detective, but all of their memories were lost.
One of the girls that disappeared mysteriously, Ruka Minazuki, had a faint memory of a single melody…
Ten years later, two of the girls that mysteriously disappeared were killed one after another.
Determined to solve the mystery of their friends' deaths, the remaining girls, Misaki and Madoka, agree to travel to Rogetsu Isle.
Ruka decides to follow them to the island. Will they find out what lies beyond their lost memories?
