Set in the Yanaka neighborhood of downtown Tokyo, this novel tells three interconnected stories linked by the Torunka Café, a small coffee shop tucked away in an alley off a busy market street. Each of the novel's three parts is narrated by a different character whose life is quietly transformed by the café and the people gathered in it.
Part One is narrated by Shūichi Okuyama, a twenty-one-year-old college student who works part time at the Torunka. On a slow Sunday afternoon, a young woman named Chinatsu Yukimura enters the café. The moment their eyes meet, she seizes his hands and says, "We meet at last" (6). She claims they knew each other in a previous life during the French Revolution, insisting she was a chimney sweep who loved a woman Shūichi once was. Shūichi is baffled, but Shizuku Tachibana, the café owner's high-school-aged daughter, is delighted and invites Chinatsu to return.
Shūichi reflects on his recent breakup with his ex-girlfriend Megumi. He recalls discovering the Torunka two years earlier and realizing he was in love with Megumi, a revelation that moved him deeply because his parents' dysfunctional relationship had left him doubting he could ever love anyone. His parents ran a cocktail lounge together but carried on affairs openly. Megumi eventually left Shūichi, telling him he never truly opened his heart.
Chinatsu begins visiting every Sunday, reading children's classics and leaving behind café napkins folded into remarkably lifelike ballerina figures. Shizuku secretly collects these in a cookie tin, dreaming of joining them into an arch spanning the counter. At Shizuku's urging, Shūichi starts walking Chinatsu to the station after her visits. They gradually open up to each other, and his feelings deepen through winter into spring.
When Shūichi asks Chinatsu on a date, she reacts with distress and confesses the past-life story was a lie. They met as small children: Chinatsu's mother was the woman Shūichi's father was seeing, and when his father visited the house, both children were left waiting outside. The older Chinatsu befriended little Shūichi, telling him stories to keep him from crying. After losing contact, Chinatsu learned years later that Shūichi worked at a café in Yanaka. She moved to Tokyo alone and spent a year searching every café on her Sundays off until she found him. She fabricated the past-life story because she feared the truth would seem unsettling. Declaring this her last visit, she runs away.
Three weeks pass with no word. Shizuku, who confides that Chinatsu reminds her of someone precious who died long ago, tells Shūichi she does not want Chinatsu to be alone. Moved by Shizuku's persistence, Shūichi goes to Chinatsu's factory, brings her back to the closed café, and tells her he is angry not about the lie but because she decided on her own that he could never forgive her and fled without letting him respond. He recognizes this same flaw in himself, since Megumi left because he was always closed off. Chinatsu reveals that Shūichi's father visited her dying mother in the hospital and helped pay for treatment, softening Shūichi's feelings toward his estranged father. When he asks if he used to call her "Chi-chan," she breaks down crying, confirming she called him "Shū-chan." He confesses his love and asks her to keep coming to the café.
Part Two shifts to Hiroyuki Numata, a weary man in his fifties who visits the Torunka and remembers it as Nomura Coffee, the café he once frequented with Sanae, the woman he loved in his youth. In flashbacks, he recalls falling in love with Sanae's quiet warmth. When a business opportunity arose, his ambition consumed him and he abandoned her. He married for money, but the marriage collapsed. He turned to heavy drinking, lost his career, and hit bottom.
A private investigator reveals that Sanae died of cancer but had a daughter named Ayako. Ayako's existence gives Numata a reason to seek treatment for his alcohol addiction and recover. He finds Ayako working at a flower shop in the neighborhood. She is twenty-six, an illustrator by trade, and cheerful and openhearted, with a habit of collecting quotations. After Numata collapses from a heart condition near her shop, they begin meeting regularly at the Torunka, where he sees traces of Sanae in Ayako's features.
A severe cardiac episode lands Numata in the hospital. His doctor tells him he has about three months without surgery, which carries roughly a 60 percent chance of success. He agrees to be admitted in three days. Unaware of his condition, Ayako presents him with apartment listings, hoping he will settle nearby. Instead, they spend the day wandering the neighborhood. At Shinobazu Pond in Ueno Park, he confesses to having abandoned someone he truly loved.
On his final evening, Ayako walks him through Yanaka Cemetery and gives him two gifts: a photograph from her mother's album showing young Numata and Sanae together, and a watercolor portrait with a Hardenbergia flower, symbolizing miraculous reunions. She has realized he is her mother's old boyfriend but does not press for an explanation. She shares a quotation of her own: "In life, reunions are the closest thing we get to miracles" (146). Numata passes through the station gates, resolved to survive and return.
Part Three is narrated by Shizuku, who reveals she has avoided coffee for nearly ten years, ever since her older sister Sumiré secretly gave her a cup at age seven and the caffeine triggered a terrifying nightmare. Sumiré, six years older and quietly mysterious, died of illness at seventeen. Their mother, struggling with grief, eventually left for Thailand to work with a nonprofit, while Shizuku stayed home with her father, Isao Tachibana, the café's owner. Each year near the anniversary of Sumiré's death, Shizuku's mental and physical health deteriorates.
That summer, Shizuku encounters Kazuhiko Ogino, Sumiré's high school boyfriend, and realizes she has fallen in love with him. Desperate for his attention, she begins wearing Sumiré's old clothes and imitating her gestures. Her childhood friend Kōta confronts her, insisting she should pursue Ogino as herself rather than disguised as her dead sister. They have a bitter fight. Ayako similarly advises Shizuku to develop what makes her unique rather than trying to become someone else.
After reflection, Shizuku confesses her feelings to Ogino as her true self, wearing her usual T-shirt and jeans. He gently turns her down, revealing he is already seeing someone. Walking home, she encounters Kōta, who has been out searching for her. She tells him what she has come to understand: She was not truly in love with Ogino but with the traces of Sumiré she saw in him. She sobs, overwhelmed, and they reconcile. Kōta reveals that Sumiré asked him before she died to look after Shizuku.
After the sixth-anniversary ceremony for Sumiré's death, Shizuku rides the train home with quiet clarity. She silently addresses her sister, understanding now that Sumiré broke up with Ogino to spare him the pain of watching her die. She accepts she cannot be Sumiré and is content being herself. In a moment of resolve, she decides to ask her father to make her a cup of coffee, her first in ten years, ready to face whatever comes next.