Sputnik Sweetheart is a work of magical realism by Haruki Murakami, published in 1999 in Japan and then in English in April 2001. The novel follows the protagonist K, who loves his friend Sumire, though she does not feel the same way. When Sumire falls in love with a woman, Miu, and disappears on a trip to Greece with her, K goes to investigate, but reality blurs as he learns more about Miu and Sumire’s relationship. The work focuses primarily on themes including Personal Growth Due to Unrequited Desire, Disconnection From Reality in the Wake of Loss, and Writing as a Representation of State of Mind. 

This guide refers to the First Vintage International edition of the novel, translated by Philip Gabriel.

Content Warning: The source material and guide feature depictions of racism, death, death by suicide, graphic violence, sexual content, and sexual abuse.

Plot Summary

K, a teacher, is in love with his best friend, Sumire. They met at university, both obsessed with reading. K, a few years older, graduated around the same time that Sumire dropped out, deciding to become a novelist. Despite her talent and assurances from K, Sumire struggles to complete an entire story. She lacks confidence and believes she needs more experience. Despite K’s support, Sumire feels no desire, romantic or otherwise, for him. To deal with this, K begins dating other women and has an affair with a student’s mother.

When Sumire is 22, she meets Miu, an older woman, at a wedding and falls in love. She and Miu chat at their table, and Miu asks Sumire to come work for her. Miu runs an international trading company, specializing in wine, and needs an assistant. At first, Sumire resists, insisting she must focus on her writing. Miu tells her that she needs more experience before she can write anything meaningful and asks her to lunch the next day.

At lunch, Miu convinces Sumire to work for her. Sumire is taken with Miu’s elegance and charm. She desires and needs her. After lunch, Miu invites Sumire to her home and gives her new clothes. Sumire, who cares little for her appearance, shocks K when she visits and tells him of this new opportunity. She begins working three days a week, learning Italian on the side.

K’s desire for Sumire is intense, and he often struggles to contain it. He helps her move into a new apartment, and, as she begins working at Miu’s office, fantasies of being with Sumire rise up and overwhelm him. Because of this, he refuses her invitation to dinner. She promises to treat him to a nice meal soon, but this is the last time he ever sees her.

Later that summer, Sumire sends K a letter from Rome. In it, she apologizes for not taking him to dinner and explains that a business trip with Miu came up suddenly. She describes their travels in Italy and how her desire for Miu is consuming her. She cannot write, an unusual prospect for her. She is also not motivated to do anything if she is not in Miu’s presence. She promises to connect with K when she returns to Japan in mid-August.

A few days later, another letter arrives, this time from France. In it, Sumire tells K that she and Miu met an Englishman who offered them his villa on a Greek island, extending their trip. K waits for Sumire’s return, but when days pass after her expected return date, he feels lost. One night, he wakes to the phone ringing. He picks up and is surprised to hear Miu. She tells him that something happened to Sumire and asks him to come to Greece. She will not explain further.

Although the school year starts in 10 days, K flies to Greece and takes a ferry to the island. Miu finds him at a café and takes him to the villa, where she explains that Sumire disappeared. The police were not helpful, and she called K because she knows Sumire trusts him.

Miu tells K that during their first four days on the island, they had a strict routine. They would go to the beach in the morning and swim, visit the village, and cook dinner. During these days, Miu noticed that Sumire was writing again. On the fourth night, Sumire disappeared without a trace.

K asks what led to this, and Miu reveals that something happened that night. After they went to bed, Miu woke to find Sumire curled up on the floor with a washcloth in her mouth, drenched in sweat. She was unresponsive, and Miu undressed and dried her, then led her back to bed. Eventually, Sumire came to and told Miu that it happens sometimes. She asked to sleep in Miu’s bed. 

Miu agreed but resisted when Sumire began unbuttoning her shirt. Sumire insisted that she loves Miu, and though Miu tried to feel desire for Sumire, she did not. She told Sumire that something traumatic happened to her 14 years ago, and since then, she had not felt desire. Sumire sobbed before returning to her room. The next day, Sumire was gone, and when she did not return the next day, Miu went to the police.

After Miu explains what happened, she and K retire for the night. The next morning, Miu decides to go to the Japanese embassy in Athens, in hopes of elevating Sumire’s case. After she departs, K goes to the beach she and Sumire went to but finds nothing. On his way back to the villa, he remembers that Miu told him Sumire was writing.

In Sumire’s room, K finds a floppy disk containing two documents. The first is Sumire’s account of how she is questioning reality, unsure of who she is. She believes that she cannot write because she uses writing to think, but since meeting Miu, she cannot think at all. She also recounts a recurring dream in which she sees her dead mother but cannot talk to her.

The second document is a retelling of the traumatic event that changed Miu. When Miu was younger, she studied music in Paris. One summer, she went to a small town in Switzerland to help her father’s business. She liked it so much that she decided to stay for the summer. Everything was fine until a man, Ferdinando, began following her. Slowly, the town lost its shine.

One day, Miu went to the town’s amusement park and rode the Ferris wheel. She was on the last ride, and the attendant forgot her, stranding her at the top for the night. While up there, Miu used her binoculars to find her apartment. Through her apartment window, she saw herself and Ferdinando having sex. 

The next day, she woke in the hospital. Her hair had turned completely white. Since that day, Miu has felt as though half of her was missing, existing in another world. The double took her hair and her capacity for desire.

K finds no clues in the documents other than the fact that both reference other worlds or realities. He begins to wonder if Sumire went to the other side, possibly looking for the Miu who can desire her. He falls asleep but wakes in the middle of the night to music. He follows the music outside but cannot locate its source. At a certain point, he feels as though he is not himself. When the feeling passes, the music is gone.

K and Miu never find Sumire, and K returns to Japan, saddened and lonely. He sees Miu only once after the island, but she does not notice him. The new school year begins, and K’s girlfriend calls him, asking him to come to a supermarket. When he arrives, an employee leads him to the security office—his girlfriend is there, along with her son, K’s student, Carrot.

The security guard accuses Carrot of stealing. It is a repeat offence. K argues that Carrot’s actions are a sign of some deeper issue, but Carrot will not speak. When another guard comes in looking for a key to their storage room, the guard cannot find it. 

In the end, the guard lets Carrot go with a warning. K sends his girlfriend home and spends time with Carrot. Carrot will not speak, but K tells him about losing Sumire, hoping this will resonate with the boy.

On their walk back to Carrot’s house, they stop on a bridge. Carrot reveals that he stole the storage key, and K drops it in the river, feeling relieved. When they reach Carrot’s house, K’s girlfriend gives him a ride home. On the way, K breaks up with her, saying it would be best for everyone, though she disagrees. K feels as though he needs to move on and find direction.

The new year arrives. K misses Sumire and dreams frequently that she calls him in the middle of the night. One night, he wakes to the phone ringing, and Sumire is on the other end. She tells him she is back from her journey and describes the moon. She is in a phone booth and tells K to come get her after she calls back with her precise location. As K waits, he looks out his window at the moon, the same one Sumire described. He feels relieved knowing they are looking at the same moon.