He was more deeply involved with the next game in the series, Moonlight Syndrome, but left Human shortly after to found his own company, Grasshopper Manufacture.

The first two volumes follow the adventures of Yukari Hasegawa, Chisato Itsushima, and Mika Kishii exploring rumors at Hinashiro Highschool and across town.

[2] Twilight Syndrome: Saikai features an original plot with new characters and doesn't continue the storyline of the previous games.

[6][7] Twilight Syndrome is a series of adventure games about high school students investigating paranormal urban legends.

[9][10] The games have heavy visual novel elements[11] and the player must make numerous dialog choices during their adventure that will affect how the investigation progresses.

[2] While the original games focused on supernatural horror, Suda wanted to shift away from paranormal elements and write about violent incidents caused by people.

[2][19][22] After the game was released on 9 October 1997,[23] Suda decided to leave Human Entertainment as he was unsatisfied with his bonuses, and felt the company would soon be bankrupt.

[26][27] The staff decided they wanted to develop a game that borrowed heavily from Twilight Syndrome's gameplay system,[28][27] and added a new sense of realism.

[32] The game is set in a city in economic decline during Japan's recession of the 1990s, three junior high students explore urban legends in their town.

[35] The game borrows the same adventure gameplay as in earlier series entries, but uses the DS's touch screen for additional interactivity with in-game objects.

[6] The development team included horror film director Osamu Fukutani,[36] and live actors were used to photograph the in-game images and record dialogue.

[12] When reviewing Kinjirareta Toshi Densetsu, Famitsu writers praised the horror elements, sound design, and touch screen implementation of the game.

[8] Gametype magazine praised the series as a stable of the horror genre, saying the games started slow but became more interesting as they went on, but also said that the plot was complex and difficult to follow for those not fluent in Japanese.

[1] In 2006, game designer Hideo Kojima said he was a "big fan" of Twilight Syndrome and that he wanted to collaborate with Goichi Suda.

[47] Suda's studio Grasshopper Manufacture has borrowed settings and characters from Moonlight Syndrome for some of their works, including The Silver Case and Flower, Sun, and Rain.

[53] The first film based on the series, Twilight Syndrome: Sotsugyō (Graduation) was released on 23 November 2000 starring Wakana Sakai.