Infinity is a Visual Novel series originally developed by KID, and later by Cyberfront after KID filed for bankruptcy during the development of 12Riven. The Infinity series was considered KID's flagship title, alongside Memories Off.
The games in the series are:
- Never 7: The End of Infinity (2000)
- Ever17: Out of Infinity (2002)
- Remember11: The Age of Infinity (2004)
- 12Riven: The Psi-Climinal of Integral (2008) (intended to be the beginning of the Integral spin-off series, but it never materialized further than this)
- Code_18 (2011) (first work developed completely without any input from the original KID staff)
The series is a Thematic Series with largely unrelated stories. The only consistent theme is science fiction and varying levels of involvement of Time Travel. Outside of that, most of the games featured multiple protagonists with multiple perspectives and Mind Screw Jigsaw Puzzle Plots. Many of these themes can be traced to writer Kotaro Uchikoshi, who wrote the first four games. After 12Riven, Kotaro Uchikoshi went to Chunsoft and directed and wrote the Zero Escape series, where many of the story themes from his works in the series can be found, and can be considered a Spiritual Successor of a sort.
Another personality significant to the series is Takumi Nakazawa, director of the first three games. After leaving KID, Takumi Nakazawa went on to create the company Regista and direct and write the visual novels Input Output and Root Double: Before Crime * After Days. All of the said works also had similar themes with the Infinity series. They eventually reunited at Too Kyo Games along with Kazutaka Kodaka, where the three of them continued making visual novels and adventure games.
The series is also distantly related to the Science Adventure Series of Steins;Gate fame, as many core members of its dev studio, 5pb. (now MAGES), are former KID staff, including composer Takeshi Abo and writer Naotaka Hayashi.
