The novel alternates between two timelines and two narrators whose lives are connected by a secret spanning decades. In 1957 Japan, a young woman defies her family to marry an American sailor and faces devastating consequences. In present-day America, that sailor's adult daughter discovers his hidden past after his death and travels to Japan seeking answers.
Tori Kovač, an investigative journalist, keeps vigil at the bedside of her dying father, Pops, at the Taussig Cancer Center in Ohio. Pops tells Tori that her mother, Mama, was the love of his life, but before that life, he lived another. He urges her to read a letter he has been carrying, an envelope bearing red kanji (Japanese characters) from Japan. Tori retreats to the hallway, overwhelmed by grief, recalling his stories about serving in the US Navy in 1950s Japan and a girl he loved whose name he never revealed.
In 1957, Naoko Nakamura is almost eighteen and facing an
omiai, an arranged marriage introduction with Satoshi, the son of her father's most important business client. A match would stabilize her family's struggling postwar trading company. Naoko, however, is secretly in love with Hajime, an American sailor stationed nearby. When she presents Hajime at a formal family tea, her father smashes the tea bowl in outrage, her grandmother calls her a foolish girl, and her brother Taro clips Hajime's shoulder as he passes. Hajime tells Naoko she must change their minds.
Naoko petitions her mother, Okaasan, but Father strikes Naoko and declares she will marry Satoshi at once. Before dawn, Okaasan wakes Naoko and presents an ultimatum: If Naoko chooses Hajime and the baby she is carrying, a hidden suitcase waits at the bottom of the hill, and she must leave and never return. If she chooses Satoshi, a midwife will terminate the pregnancy. Naoko takes the suitcase.
In the present, Pops's cancer worsens, and he secretly opts for hospice care without telling Tori. He adds a revealing detail to a childhood story about a magic tree: The tree was the setting for a wedding, and the bride wore a kimono. Pops dies with Tori at his side. Alone in her hotel room, Tori opens the returned letter, which Pops signed under the name Hajime. His words are addressed to "Cricket": He wishes only to know their daughter is well and for "Little Bird" to know she has always been in his heart. Tori is stunned to learn her father had another daughter.
In 1957, Hajime returns to the thatched house and finds Naoko waiting. He proposes they marry that night. Hajime secretly brings Okaasan, who arrives with her treasured
shiromuku, a traditional white wedding kimono. The ceremony takes place under paper lanterns glowing in the trees, officiated by a Shinto priest. The next morning, Naoko reveals she may be pregnant, and Hajime is overjoyed. His commander, however, refuses to sign the US marriage paperwork, complicating his ability to return to Japan after discharge. Before his ship departs, Naoko gives him her father's silk scarf to guarantee his return.
Weeks later, Naoko discovers that Okaasan has died of heart failure. Her father blames Naoko, claiming the stress of the secret wedding stopped her mother's weak heart. Naoko's grandmother arranges for her to be sent to the Bamboo Maternity Home, ostensibly for pregnancy tests. The facility is a secluded compound behind a locked bamboo fence, run by Housemother Sato as a hidden place for unwed mothers carrying unwanted or mixed-blood babies. On Naoko's first night, a girl delivers a baby boy who cries once, then falls silent. Naoko realizes Housemother Sato kills the babies at birth.
Naoko befriends Hatsu, quiet with sad eyes, and Jin, a thirteen-year-old pregnant from assault. They discover a hidden field of
Jizō statues, small Buddhist guardian figures in red bibs believed to help baby souls cross to the afterlife. Beyond them lies a grove covering the unmarked graves of mixed-blood babies. The girls form a pact: They will make
Jizō for every forgotten baby, and if they cannot keep their own children safe, they will seek Brother Daigan, the guardian spirit, rather than let Housemother Sato kill them.
Jin's baby is killed at birth during a failed escape attempt. Hatsu escapes, but Naoko is recaptured. Months of captivity follow as Housemother drugs Naoko's tea to keep her bedridden. A new girl, Sora, discovers the drugged tea and helps plan a second escape. They burn through the bamboo fence with a lantern flame and flee to a nearby monastery, where Naoko goes into labor at the gate.
Little Bird is born tiny, jaundiced, and struggling to breathe, but alive. Sora brings crushing news: Hajime has not returned, and their rented house has been given to another family. When Naoko's father visits the monastery, he refuses to accept Little Bird, listing the burdens of raising a mixed-race child in Japan. He tells Naoko she is welcome home, alone. Naoko spends a final night telling Little Bird every story she knows, then honors her pact by wrapping her daughter tight and seeking Brother Daigan.
After Pops's funeral, Tori investigates his past. In his storage unit, she discovers navy dress whites containing a silk wedding pouch and a marriage affidavit bearing his signature alongside Japanese characters. Pops did not merely attend a wedding under the tree. It was his own. She sells his Cadillac to fund a trip to Japan, where her colleague Yoshio Itō at the
Tokyo Times traces the address on the envelope to a traditional house in Zushi still registered under the Nakamura name.
Tori visits the house and finds an elderly woman clipping white chrysanthemums in the garden. The woman invites her for tea, then reveals she knows who Tori is: She recognized Pops's blue eyes and the silk scarf Tori wears, the same one Naoko gave Hajime decades ago. Naoko shares her entire story, and Tori reads Pops's letter aloud. When a woman named Shiori arrives, calling Naoko "Okaasan" (Mother), Tori's heart races, but Naoko confirms Shiori is not Little Bird. Naoko's husband, Satoshi Tanaka, arrives to escort her home. Naoko asks Tori to promise that if she finds Little Bird, she will give her the silk scarf.
Tori rides the train to Hiratsuka and walks to the former maternity home site, where a monk leads her to the field of
Jizō statues. When Tori asks about Brother Daigan, the monk points to the statues:
Ojizō-sama is not a person but the spirit that helps baby souls cross over. Naoko did not hand Little Bird to a monk; she gave her daughter's spirit to the afterlife. Under a prominent tree, a circle of statues stands surrounded by white chrysanthemums, the same flowers Naoko picks every week. One bears a wooden marker:
Chīsai tori, "Little Bird." Tori collapses. Her father named her Tori, Japanese for "bird," after the daughter he lost. She and Little Bird share the same name. She wraps the silk scarf around the statue, fulfilling her promise, and stays through the night telling her sister about Pops.
In the epilogue, Naoko reflects that years after marrying Satoshi, she once saw a vision of Hajime walking toward the family house, but when she reached for him, her fingers grazed only light. After meeting Tori and learning her name, Naoko finds peace, knowing Hajime carried Little Bird's memory forward by naming his American daughter after the one he lost.