Twilight Syndrome: Kyuumei Hen (トワイライトシンドローム～究明編～) is a Adventure/Horror video game published by HUMAN Entertainment released on July 19th, 1996 for the Sony PlayStation.
Is a horror themed visual novel / adventure video game series released exclusively in Japan. Goichi Suda directed the first two games and a spin-off, Moonlight Syndrome.

The first two volumes follow the adventures of Yukari Hasegawa, Chisato Itsushima, and Mika Kishii exploring rumors at their school and across town in 1996. Initially planned to be one game, it was split into two volumes due to development timelines. They were later released in one package in July 1998 as Twilight Syndrome: Special . A mobile version of Kyūmei-hen was released in 2008.

Twilight Syndrome: Kyuumei Hen created by