Uchikoshi , who was freelancing at the time , came up with the original concept and pitch for the game after having started to research material in August 2001 , including the Russian mathematician P. D. Ouspensky 's book '' Tertium Organum '' . A month later , he took a trip to Bali , from which he got a lot of inspiration for the story . As he was getting ready to return to Japan , he saw live news coverage of the September 11 attacks ; because the game 's plot was conceived during this time , Uchikoshi said that the story was influenced by the " spirit of the time " following the attacks . He wrote it from September until February the next year , after which the story was divided among the scenario writers , who wrote the script over the course of three months , from March to May 2002
September 11 attacks
September 11 attacks
Ever 17: The Out of Infinity