Towairaito Shindoromu: Tansakuhen (トワイライトシンドロム:探索編, lit. "Twilight Syndrome: Search") is a Japan-only video game developed and published by Human Entertainment, released on the Sony PlayStation in 1996. The game was written and directed by Suda51.


Towairaito Shindoromu: Tansakuhen is set up as a mystery, requiring the player to travel around the game's environments attempting to discover the truth behind the so-called "Twilight Syndrome." Progression is divided into chapters called "rumours," each of which has a good ending, a normal ending, and multiple bad endings; the good and normal endings result in the protagonists learning a little more of the truth, while the bad endings result in the character's death. Naturally, the player must achieve either the good or normal ending in order to advance to the next rumour.


The op song is called "Crystal Rain," by LOVEFIXER.

Grasshopper Manufacture games
International Shining Soul · Shining Soul II · killer7 · Michigan: Report from Hell · Samurai Champloo: Sidetracked · Contact · No More Heroes · Flower, Sun, and Rain: Murder and Mystery in Paradise · No More Heroes 2: Desperate Struggle · Frog Minutes · Shadows of the DAMNED · Sine Mora · Diabolical Pitch · Lollipop Chainsaw · Liberation Maiden · Black Knight Sword · Killer Is Dead · Short Peace: Ranko Tsukigime's Longest Day · The Silver Case · Let It Die · The 25th Ward: The Silver Case
Japan-exclusive Shirubaa Jiken · Flower, Sun, and Rain · Shirubaa Jiken 25 Ku · Blood+: One Night Kiss · Zero: Tsukihami no Kamen · Evangerion Shin Gekijōban -Saundo Inpakuto- · No More Heroes: World Ranker · Dark Menace
Upcoming Travis Strikes Again: No More Heroes
Other Suda material Super Fire Prowrestling III: Final Bout · Super Fire Prowrestling Special · Towairaito Shindoromu: Tansakuhen · Towairaito Shindoromu: Kyuumeihen · Moonlight Syndrome · Sdatcher · Liberation Maiden SIN · Tsukikage no Tokio · Kurayami Dance · Suda Fables