Due to the death of his childhood friend, Shinpei returns to his native home, but beneath the surface this island seems to hold some secrets.

Upon hearing of Ushio's death, Shinpei returns to his hometown of Wakayama City on Hitogashima and reunites with his childhood friend's family. The funeral goes smoothly, but under the surface something strange is brewing on the island. What mysteries await him on this secluded summer island?