Haruki Murakami gradually found writing novels in the first person using "boku" (I), which he had continued for nearly 20 years, to be increasingly stifling. After "The Wind-Up Bird Chronicle" (1994), he began to incorporate third-person narration (Reference: Haruki Murakami, "Novelist as a Profession," Shincho Bunko).
In "1Q84," the story had progressed alternately from the perspectives of two characters: Aomame, who assassinated the cult leader, and Tengo, who has a special relationship with Aomame. However, from this volume onward, unexpectedly, the perspective of Ushikawa (an ugly tracker hired by the cult) was added!
Around Aomame and Tengo exists a mysterious world that transcends space, time, and dimensions. By adding Ushikawa's viewpoint from the real world, it created an effect like sprinkling salt on a watermelon to enhance its sweetness.
By the way, there is a scene where a character named Kumi Adachi says, "Isn't it a dull name?" I wondered why for a while—but does it mean that adding the syllable "n" to the end of the name would change that!? (No way, no way)