Rokkenjima is a fictional Japanese island of which the world of the 07th Expansion's 2007 murder mystery dōjin soft visual novel series Umnineko no Naku Koro ni (also known as "Umineko When They Cry", "When They Cry" and "When the Seagulls Cry") takes place.
A secluded isle located off the coast of Japan, 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.