Gesshoku no Akuma no Kamen (Demonic Mask of the Lunar Eclipse)

When two of her six friends die and two more go missing on Rougestu Island, Minazuki Ruka returns to the island with her new near eleven year old friend of the summer Tsukiyo Hinata, the only one not connected to the island and goes with her on Ruka's mother's request with a Goblin-version of the woman's Spirit Flashlight. Will Ruka regain her lost childhood memories, or will they even leave Rougestu Island alive?

(I am getting my info from pyschadelicsnake on youtube. The title is google translated Demonic Mask of the Lunar Eclipse. I DO NOT OWN HARRY POTTER OR FATAL FRAME!)