The game, set "five minutes into the future of 1988", opens with the
silent protagonist, whose name is given by the player, having just obtained a computer. When the player checks their messages, they learn the telephone number to the
Lake City Local BBS, a local board, and can then log on to there. One of the topics posted to that board is some poetry by a girl named "*Emilia"; when the player responds to her message, the two start up a conversation. While this conversation is ongoing, the player learns of another BBS and of a board whose telephone number is in another area code. They also learn of
an illegal method to get access to boards like that, which would otherwise require the purchase of long distance calling cards. The conversation between the player and *Emilia, which is inferred to have taken place over a much longer duration of time than has transpired in reality, begins at this point to show *Emilia forming an attachment to the player. Soon after, *Emilia confesses to the player that she loves them; the host computer for Lake City Local then breaks down, however, leaving the player unable to contact her. Soon afterwards the owner of Lake City Local contacts the player with a garbled message that *Emilia had tried to send to them. This message implies that *Emilia is in danger, asking the player to contact someone named *Paris, and provides
a mass of binary code. The player has no context for this message; but after hacking into another BBS,
The Gibson, the player finds a cryptic message reposted from another board saying that there are several
artificial intelligences (AIs) around the world that have been recently "killed", naming *Emilia as one of them. The player hacks into the source board for this message, and finds a history of artificial intelligence posted there by *Blue Sky, a "historian" AI. According to *Blue Sky's records, the American government created an AI at the same time it created
ARPANET in the 1970s. This AI, *Mother, in turn created child AIs, but its first attempt spread out of control and had to be destroyed by a virus that spread after it—later officially explained by the government as the real-life
Creeper and Reaper worms. *Mother's later attempts, which could only exist on one system at a time, were more successful, and these AIs left the ARPANET in favor of the Internet when it was developed. *Reaper, however, continued to spread and destroyed any AI it found, such as *Emilia. The player finds *Paris, another AI and *Emilia's brother, on an ARPANET node, who explains that compiling the binary code in *Emilia's message can recreate her. The player compiles *Emilia onto their system, and the two learn of a "
payload" that the other AIs have developed, which
exploits a
vulnerability that can cause *Reaper to self-terminate; however, infecting *Reaper with it requires that an AI be recompiled with it as living bait, meaning permanent deletion. Realizing that they have no other choice, *Emilia becomes the payload carrier. After a final conversation, the player allows *Emilia to sacrifice herself, saving the AIs and ending the game. == Development ==