Rokkenjima

Rokkenjima  is a fictional island of which the world of Umnineko no Naku Koro ni takes place. A secluded island, Rokkenjima is owned by the extremely wealthy Ushiromiya family with Kinzo as the patriarch. Once a year, the family gets together for an annual meeting, mostly to discuss who would inherit Kinzo's fortune once he dies. In 1986, a series of grisly murders transpire on the island; appearing to be the work of a witch, the goal for the rest of the series is to find out who the murderer is, and acquire the mass fortune. Rokkenjima was originally named Azukishima, and was believed to have been inhabited by demons. That is until a traveling monk purified the island by building a shrine on a rock. Rokkenjima is located off the coast of Japan.