Fault Lines

Set in contemporary Tokyo, the novel is narrated by Mizuki, a Japanese housewife and former singer who lives in a thirty-second-floor apartment with her husband, Tatsuya, a corporate executive, and their two children, ten-year-old Eri and four-year-old Aki. Mizuki opens by reflecting that what she calls "the Kiyoshi situation," her affair with Teramoto Kiyoshi, the man who will upend her carefully ordered life, began long before Kiyoshi himself appeared, rooted in the cracks already running through her marriage. She frames the story as one last reckoning before committing to gratitude for her outwardly perfect existence.

The depth of Mizuki's unhappiness becomes clear early. One Tuesday evening, after Tatsuya dismisses her request for help with the laundry with a look of contempt and retreats to the balcony with his phone, Mizuki climbs onto the railing of the opposite balcony. She throws her weight back to safety almost instantly, characterizing the incident not as a genuine attempt but as a physical eruption of the screaming inside her head. The marriage has deteriorated over their sixteen years together. After Tatsuya's promotion, Japanese corporate culture consumed him entirely; he stopped coming home at reasonable hours, stopped noticing her, and began treating the apartment like a hotel. When she tried to confront him, he grew more sullen, and she eventually stopped, realizing he never heard what she was really saying: that she missed him and needed him.

Mizuki works part-time as an intercultural consultant, helping Western expatriates navigate Japanese customs. During a session at a bookshop café with Laurence, a British client, a stranger approaches their table claiming someone dropped a credit card. Mizuki barely registers the man, but during Tokyo Fashion Week, unseasonable rain forces them both under the same overhang near Omotesandō station. He recognizes her, and their conversation crackles with attraction. Mizuki's friend Eloise, a glamorous Frenchwoman, arrives and sweeps her away, but outside Chanel, Mizuki collides with the man again. He asks to take her out; she tells him she has children and a husband. He offers her his meishi, a business card, bows, and tells her to contact him if she changes her mind.

Mizuki grew up in a rural province, the only child of a sweet-shop owner she adored. At sixteen, her father enrolled her in a foreign exchange program, and she spent a year in New York with the Michaelson family, whose warmth and permissive lifestyle opened her eyes to freedoms she had never imagined. She returned to Japan alienated from provincial life, saved money, and went back to New York to pursue singing. She built a modest career singing covers in clubs and jazz bars, but she was talented rather than extraordinary, and eventually the limits of her ability, combined with industry sleaze and poverty, eroded her ambition. She met Tatsuya at one of her last gigs. Despite his polished appearance, he was guileless and sweet, and they married a year later. Her father died of a heart attack on his fiftieth birthday, and Mizuki carries guilt that her rebellion may have contributed to his decline.

After a rare warm Saturday spent swimming as a family, Mizuki retrieves Kiyoshi's business card and burns it on the balcony, though the address is already memorized. Days later, an argument with Tatsuya over a fruit salad he ignores escalates into a confrontation about their marriage. Mizuki reveals she once discovered he slept with a client, but the deeper betrayal is his having made her invisible. She storms out, rides the Metro to Shibuya, and walks through neon-drenched streets. Her route carries her, seemingly by accident, to the Jingūmae neighborhood where Kiyoshi's restaurant Kami is located. She ducks into a nearby bar, where Kiyoshi appears beside her. He reveals he owns this bar and one other restaurant, and they talk easily. For the first time in years, Mizuki feels seen.

Over the following months, Mizuki and Kiyoshi spend time together in outings she insists are not dates. They visit a traditional sweet shop in Kagurazaka, where a candy-maker's movements painfully remind Mizuki of her father. Kiyoshi tells her about growing up in Paris after his mother died of cancer when he was nine, leaving him and his brother as latchkey children. He learned to cook there and confesses that opening restaurants was partly an attempt to bring his mother back to the dinner table. Mizuki recognizes the same grief in herself. They explore cemeteries, temples, and the Golden Gai bar district from Mizuki's singing days. She compartmentalizes, saving Kiyoshi's number under the name of a mamatomo, a fellow mother from school, as her cover story with Tatsuya, who never questions her absences.

Kiyoshi invites Mizuki to a dinner at Kami to help charm American investors interested in funding a restaurant in New York. The evening succeeds, but as Mizuki tries to leave, Kiyoshi follows her down the lantern-lit entrance hall, asks why she lied about knowing him, and kisses her.

Their affair begins the following spring. Walking along the canal at Nakameguro during cherry blossom season, Kiyoshi takes Mizuki's hand, and that evening they sleep together. The spring and monsoon pass in a blur of afternoons together. Yet domestic life continues. One evening, Tatsuya tentatively asks if she wants to watch a film. She nearly refuses, then relents. They share tea and crackers, joke about a Kurosawa movie, and go to bed brushing their teeth side by side. The small moment of genuine reconnection disturbs Mizuki more than any fight.

Mizuki articulates why she will not leave Tatsuya: It would not make anyone happy. Not the children, whose lives would be broken. Not Tatsuya, whose face she could never forget. Not herself, who would always wonder if the decision was right. Tensions surface when Kiyoshi reveals he plans to forgo his year-long New York assignment to stay near her. They argue, and Mizuki recognizes that the end has begun.

A major earthquake strikes while Mizuki and the children are on the subway, dressed in traditional summer clothes for a festival. The train lurches to a halt underground, and a ceiling fixture crashes onto the seat where Eri had been sitting moments before. Mizuki forces the doors open, grabs both children, and races to street level. Tatsuya calls, and she breaks down confirming they are safe. That night she curls up next to him for the first time in years. At 2:00 a.m. Kiyoshi calls; she slips into the living room, flooded with relief to hear his voice. She realizes she has been existing in two realities, and her children can only live in one. She sends Kiyoshi a message asking to meet at the Nezu cemetery, then pushes her phone off the balcony.

At the cemetery, Mizuki arrives early. When Kiyoshi sits beside her, she tells him she cannot continue. He says he understands, kisses her forehead, and tells her he will never be sorry. He walks away. Mizuki closes her eyes, thinks of her children's faces to keep from running after him, and when she opens them, he is gone.

In the aftermath, Mizuki rebuilds. Eri's bullying by a classmate unites Mizuki and Tatsuya in fierce parental solidarity. Mizuki begins French lessons with Eloise on Saturday mornings while Tatsuya takes the children to the park, and she takes a part-time interpreter job. Tatsuya accepts the new arrangement, noting that the children and Mizuki seem happy. They talk on the terrace one evening without screens, and she notices gray at his temples, remembering when everything about him was jet-black. She and Eri plan a trip to Paris. An ema, a wooden votive wish plaque from the Kagurazaka temple, still sits on a bookshelf; Mizuki waits for the day it will be only a beautiful object, no longer a reminder. The novel closes with Mizuki affirming her love for her family and the small rhythms of domestic life, ending on a final, ambiguous refrain: "And you, and you, and you."