The events of the story take place in fictionalized 1984, with the first volume set between April and June, the second between July and September, and the third between October and December.
The narrative is composed of two storylines that alternate by chapter. The book opens with Aomame's perspective as she catches a taxi in Tokyo on her way to a work assignment, noticing that Janáček's Sinfonietta is playing on the radio. When the taxi gets stuck in a traffic jam on the expressway, the driver suggests that she get out of the car and climb down an emergency escape in order to make her important meeting. Aomame makes her way to a hotel in Shibuya, where she poses as a hotel attendant in order to assassinate a hotel guest. She performs the murder with a tool that leaves almost no trace on its victim, leading investigators to conclude that he died a natural death.
As the story unfolds, Aomame has several bizarre experiences, including a string of memories that do not line up with the archives of major newspapers. One of them concerns a group of extremists who are engaged in a standoff with police in the mountains of Yamanashi Prefecture. Upon reading these articles, she concludes that she must be living in an alternate reality, and suspects that she entered it about the time she heard Sinfonietta on the radio.
The second chapter introduces Tengo, whose mentor Komatsu asks him to rewrite an awkwardly written but otherwise promising manuscript that had been entered in a literary contest. Komatsu wants to submit the novel to a prestigious literary agency and promote its author as a new literary prodigy. Tengo has reservations about rewriting another author's work, especially that of a high school student. He agrees to do so only upon meeting the original writer, who goes by the strange name "Fukaeri," and asking her permission. Fukaeri, however, seems to care very little what happens to the manuscript, telling Tengo to do as he likes with it.
Soon it becomes clear that Fukaeri, who is dyslexic, neither wrote the manuscript on her own nor submitted it to the contest herself. Tengo's discomfort with the project deepens upon finding out other people must be involved. To address his concerns, Fukaeri takes Tengo to meet her guardian, a man called Ebisuno-sensei (戎野先生), or simply sensei to Fukaeri. Here Tengo learns that Fukaeri's parents were members of a commune called Takashima (タカシマ). Her father, Tamotsu Fukada (深田保) was Ebisuno's friend and colleague, but they did not see eye-to-eye on this subject. Fukada thought of Takashima as a utopia; Ebisuno, however, describes the commune as a place where people were turned into unthinking robots, saying that it was like something out of the world of George Orwell's novel. Fukaeri, whom Ebisuno-sensei calls Eri (エリ), was only a small child at the time; she sits quietly through the discussion, noting only that Takashima was fun.
In 1974, Fukada and 30 members founded a new commune called Sakigake (さきがけ). The young members of the commune work hard under Fukada's leadership, but eventually disagreements split the commune into two factions, and the more radical form a new commune called Akebono (あけぼの), which eventually has a gunfight with police near Lake Motosu (本栖湖) in Yamanashi Prefecture.
One day, Fukaeri appears on Ebisuno-sensei's doorstep. She does not speak and will not explain what happened to her. When Ebisuno attempts to contact Fukada at Sakigake, he is told that he is unavailable. Ebisuno thereby becomes Fukaeri's guardian, and by the time of 1Q84's present, they have not heard from her parents for seven years, leading Ebisuno to fear the worst.
It is while living with Ebisuno that Fukaeri composes her story, Kūki Sanagi. Unable to write it herself, she tells it to Azami (アザミ), Ebisuno's daughter. The story is about a girl's life in a commune, where she met a group of dwarfs, whom Fukaeri refers to as "Little People (リトル・ピープル)".<13>
Aomame and Tengo's parallel world's begin to draw ever closer. Aomame is introduced to a 10 year old girl named Tsubasa through the dowager. It transpires that Tsubasa and her parents have been involved with Sakigake. Tsubasa herself has been forcefully abused by the cult leader named only as `The Leader.` As Tsubasa sleeps in the safe house owned by the Dowager the `Little People` which are mentioned in Air Chrysalis by Fuka Eri appear from Tsubasa's mouth and proceed to repair some sort of object which is hidden under Tsubasa's bed.
The reader discovers that the Dowager has decided that `The Leader`will in-fact be Aomame's next target. This proves to be an near impossible task as The Leader never ventures outside the walled enclosure which houses Sakigake.
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