Umineko no Naku Koro ni (うみねこのなく頃に, Umineko no Naku Koro ni? lit. When Seagulls Cry) is a Japanese murder mystery dōjin soft visual novel series produced by 07th Expansion. The first game in the series, Legend of the golden witch, was first released at Comiket 72 on August 17, 2007 playable on the PC; the game sold out in thirty minutes. The story focuses on a group of eighteen people on a secluded island for a period of two days, and the mysterious murders that befall most of the people. The goal of the game is to discern whether the murderer is human or of some other supernatural source. Umineko is the third title in the "When They Cry" series, preceded by Higurashi no Naku Koro ni and Higurashi no Naku Koro ni Kai.

A manga series adapted from the games began with two different artists working separately on different story arcs, and is published by Square Enix. The first manga, an adaptation of Legend of the golden witch, began serialization in December 2007 in the Japanese manga magazine Gangan Powered, and is illustrated by Kei Natsumi. Following the manga's release in Japan, an anime will be adapted. The word umineko is the name of a kind of seagull known as a Black-tailed Gull. Naku can mean "to make sound" (鳴く, "to make sound"?), specifically referring to those sounds made by non-human organisms, or "to weep" (泣く, "to weep"?). It so happens that the English verb "to cry" carries the same double meaning as naku. According to the original creator, Ryukishi07, the red Na (な) in the logo is an official part of the title.

Source: Wikipedia