In a classroom in Seoul, a young woman watches her Greek language teacher at the blackboard. She tries to speak but has lost her voice. Her teacher finds himself drawn to the silent woman, for day by day he is losing his sight. Soon the two discover a deeper pain binds them together. For her, in the space of just a few months, she has lost both her mother and the custody battle for her nine-year-old son. For him, it's the pain of growing up between Korea and Germany, being torn between two cultures and languages, and the fear of losing his independence.

In a small, tidy apartment on the outskirts of the frenzied metropolis of Seoul lives Kim Jiyoung. A 30-something-year-old “millennial everywoman”, she has recently left her white-collar desk job - in order to care for her newborn daughter full-time - as so many Korean women are expected to do. But she quickly begins to exhibit strange symptoms that alarm her husband, parents, and in-laws: Jiyoung impersonates the voices of other women - alive and even dead, both known and unknown to her.

When Ralph and Abby Lamb move in with Ralph’s mother, Laura, Abby hopes it’s just what she and her mother-in-law need to finally connect. After a traumatic childhood, Abby is desperate for a mother figure, especially now that she and Ralph are trying to become parents themselves. Abby just has so much love to give—to Ralph, to Laura, and to Mrs. Bondy, her favorite resident at the long-term care home where she works. But Laura isn’t interested in bonding with her daughter-in-law. She’s venomous and cruel, especially to Abby, and life with her is hellish.

As a child, Natsuki doesn’t fit into her family. Her parents favor her sister, and her best friend is a plush toy hedgehog named Piyyut who has explained to her that he has come from the planet Popinpobopia on a special quest to help her save the Earth.

Across two parallel narratives, Murakami draws listeners into a mind-bending universe in which Lauren Bacall, Bob Dylan, a split-brained data processor, a deranged scientist, his shockingly undemure granddaughter, and various thugs, librarians, and subterranean monsters collide to dazzling effect. What emerges is a novel that is at once hilariously funny and a deeply serious meditation on the nature and uses of the mind.