Japanese household register

The Japanese family register is more than a record of births, marriages, addresses, and deaths: it is the administrative framework through which the novel’s characters become legible as particular people, and through which those identities can be altered or lost. Its power is starkly visible when public records certify that a dead husband was Daisuké Taniguchi even though his brother says he was someone else, and when the possibility of having no register at all means that a person may be missing from the state’s account of life and death. The register makes identity official, but the story repeatedly shows that official identity and lived personhood do not necessarily coincide.

Administrative record and state recognition

The novel traces the register’s changing functions through a conversation between Kido and Nakakita. Its beginnings lay in the late sixth-century Ritsuryo system, an imperial bureaucracy modeled on China and concerned principally with policing and taxation. In the Edo period, the register also became a means of monitoring religious affiliation and enforcing controls on Christianity; records connected people to Buddhist temples and gathered information about birth, marriage, adoption, residence, occupation, and death. Yet the system never included everyone. Vagrants and others remained outside its account, a persistent gap in the idea that the state could register a population completely.

The modern register followed a shift in the relationship between people and land. When freedom of movement was recognized in the late nineteenth century, the older land-based system became obsolete, and a new register was introduced in the Meiji period. It served conscription and tax collection, purposes that gave people reasons to abandon or falsify records. The register therefore appears not as a neutral mirror of society but as an instrument of governance that people might need to evade, manipulate, or leave behind.

Nakakita explains that later recordkeeping measures—including copies held by Regional Affairs Bureaus and the digitization of records—did not eliminate the problem of people excluded from registration. Some children remained without a register because of the three-hundred-day rule: a child born within three hundred days of a divorce was legally presumed to be the former husband’s child. In cases where a woman had left an abusive marriage and had a child with a new partner, fear or difficulty surrounding the birth notification could leave the child unregistered. Such children could meet the conditions for Japanese citizenship and still remain outside the state’s knowledge. If they died in the tsunami, official records would not register either their arrival in the world or their deaths.

The conversation makes the consequences of that absence unusually stark: for an unregistered person, public records might contain no beginning from which to record an ending. Kido wonders whether X might have been such a person and whether Daisuké’s disappearance could therefore be concealed by an exchange of registers. If Daisuké had assumed the identity of someone absent from public records, a death could go unrecognized even if a body were found; if the tsunami had taken him, the physical evidence needed to identify him might be gone as well. The register is thus both a tool for locating a person and a condition that determines whether the state can recognize that person as having existed.

Nakakita connects that power to the register’s historical exclusions, including the way Japanese assimilation policies treated people on the Korean Peninsula. Kido, a naturalized Japanese citizen of Korean ancestry, understands that records and names have consequences beyond routine administration. Nakakita adds that residence certificates now perform much identity management, while linking taxes and social security through the My Number system could make the family register redundant. Kido counters that combined systems might also make identity trading easier; biometrics, Nakakita suggests, could make such evasion nearly impossible. The exchange leaves the register situated in a longer history of administrative identification, not as a relic whose effects have simply ended.

The register as evidence and legal machinery

The case that first brings Kido into contact with the register’s contradictions concerns Rié’s dead husband. Government officials had accepted “Daisuké Taniguchi” as his identity when recording his marriage and later his death. He had driven using a license, received medical care through health insurance, and made pension contributions. Public records supported the same identity, and his account of growing up in Gunma appeared consistent. Yet Kyoichi Taniguchi, the actual Daisuké’s brother, had seen a photograph and insisted that the dead man was not his brother. The discrepancy is not between a legal identity and a life lived outside official systems: the records are thorough. The difficulty is that they document a person under an identity that another person says was borrowed.

The register’s legal force also shapes the aftermath of the discovery. Because the register containing Rié and “Daisuké Taniguchi” gave their legal residence as Rié’s family home, Kido petitioned the Miyazaki Family Court. He sought first to cancel the removal of “Daisuké Taniguchi” from the register on account of death, restoring the record to a living status so that the police would not be left with a missing person who was legally dead. He then sought to remove that name from Rié’s register and restore her maiden name, Takemoto. This would annul the marriage on the basis of error and erase the second marriage from the register. The legal correction had an intimate consequence too: Hana, Rié’s child with X, would become legally illegitimate. The court required Rié to appear in person and requested DNA evidence that X was not Daisuké, so Kido gathered samples from X’s personal effects, including hair from clothing, nail clippings, an electric razor, and a toothbrush.

The plot’s identity puzzle turns on the distinction between a name used informally and an identity accepted by the state. X did not merely introduce himself under another name: officials had verified him as Daisuké through marriage and death registrations, while routine documents reinforced the same identity. The register could therefore make an impersonation durable across government records and ordinary transactions. At the same time, its legal entries supplied the evidence by which Kido could begin to undo the marriage and investigate what had happened to the real Daisuké.

Exchange, memory, and selfhood

The register’s exchangeability is not simply a change of paperwork. In conversation with Kido, Daisuké says that after a year of living under an exchanged register, a person becomes different. When Kido addresses him as Daisuké Taniguchi, Daisuké initially does not experience the name as his own. He says that the exchange carries the past along with it: before the swap he hated the Taniguchis, but afterward Kyoichi appears to him as merely the comic owner of a provincial inn. A new official identity has not just renamed him; it has reorganized the relationships through which he understands his history.

Daisuké describes forgetting as something that happens when relationships are cut and a person moves elsewhere, but insists that deliberate forgetting cannot erase a hated past. His alternative is to overwrite it with someone else’s until the old story becomes unrecognizable. The register provides the administrative structure for that transformation, but the account of transformation is psychological and relational: a name can be exchanged on paper, while the past must be covered by living another story. Kido had assumed that adopting a new identity meant taking on another person’s trauma. Meeting Daisuké makes him reconsider; the man before him seems radically different from the Daisuké described by Misuzu, even as Kido recognizes him as Kyoichi’s missing brother.

Daisuké’s own account of his adopted past shows how incomplete and inventive that process remains. He says he had never met the real Sonézaki and constructs his imagined history by picturing what Hara might have been like as the son of a yakuza. In that imagined past, he was once a boxer. The details do not reproduce Hara’s life exactly; they reveal how Daisuké builds a self from the life of the person whose identity he has taken, while retaining a distinction between the absent original and his own conception of him.

The transactions also expose a market in which registers differ in perceived value. Hara changed registers twice, first becoming Yoshihiko Sonézaki and then exchanging with Daisuké. Daisuké says that multiple exchanges were ordinary in that world and that someone who had swapped only once, as he had, was comparatively unusual. Hara’s history made Sonézaki one of the few plausible partners, though Hara disliked him when they met in person. The “Daisuké Taniguchi” register was especially desirable because it carried a clean record and no criminal history; one person repeatedly traded registers in hopes of obtaining it. Daisuké, wanting to cut ties with his family, was prepared to exchange with almost anyone but did not want a criminal record or someone who might pursue the Taniguchi estate. He ultimately trusted Hara because he believed Hara could use the identity to begin again.

That trust depended on a personal judgment as well as the perceived value of the record. Daisuké recalls that Hara listened to his story and said he wanted to make the most of the life he had left. Though they met only twice, Daisuké liked him and believed he was sincere despite everything he had endured. The exchange therefore joins an administrative asset to an encounter between two people: a sought-after clean record becomes the means by which Hara can pursue a different life, and Daisuké gives it to someone he considers worthy of that chance.

Family names and the life that remains

The register’s stakes extend beyond the adults who trade identities. When Rié tells Yuto that she will return to her maiden name, he eventually explains that he wants to remain Yuto Taniguchi. His name has changed before: he was born a Yoneda, became a Takemoto after Rié’s divorce, and became a Taniguchi upon her second marriage. Now in middle school, he does not want to correct everyone who knows him as Taniguchi or to return to a name that feels to him like his grandparents’ rather than his own. His preference is not a simple endorsement of the false identity. It expresses the continuity of a life shaped by school, friends, and everyday recognition under a name he has already lived with.

Yuto links that wish to his father’s memory. He asks when Rié will make a grave for him and objects that the ashes have remained in an urn while she hardly speaks about him. He fears that, after his father’s own family turned away from him, returning to Takemoto might mean that they too will forget him. The register’s correction may remove the marriage from the official record, but it cannot by itself settle what the dead man meant to the people who knew him. Yuto’s request separates legal parentage and naming from affection: even as Rié’s official name changes, he wants to preserve the Taniguchi name as a bond with the father he remembers.

When Rié finally tells Yuto that a lawyer has spent more than a year investigating his father and that she now knows why he changed his name, the disclosure gives him a new way to understand their relationship. After reading the account, Yuto recognizes that his father treated him as he himself had wished his own father would treat him. Rié affirms that this was part of the reason, while adding that he also cared about Yuto. The register exchange, initially a concealed alteration of identity, therefore reaches the next generation not only through a legal surname but through an act of care that Yuto can interpret as part of his father’s life.

Significance

The Japanese family register operates at once as a record, a legal mechanism, and a vulnerable boundary around social existence. Its entries can make an assumed identity appear seamless across marriage, death, licensing, medical care, and pensions; its revisions can annul a marriage and alter a child’s legal status; its absences can leave people outside official accounts of birth and death. Yet the register cannot settle every question it raises. A correct legal record may still conceal a person’s history, and the removal of a name cannot erase the memories and relationships attached to it.

The novel’s recurring contrast is between administrative continuity and lived change. A register can be transferred, corrected, or restored, while a person’s sense of self is remade through distance, relationship, and the story told about the past. Daisuké believes an identity must be overwritten rather than simply forgotten; Yuto, facing the legal erasure of his mother’s second marriage, asks to keep the family name that connects him to his father. In these different ways, the register makes visible both the state’s power to recognize a person and the limits of that recognition: official identity can be changed, but the human ties formed under it do not disappear by decree.