Makoto Hara and Daisuké Taniguchi’s family-register exchange

Makoto Hara and Daisuké Taniguchi’s family-register exchange was a deliberate transfer of legal identities between two men, not simply an assumed name. Hara had already changed registers once; the second exchange gave him Daisuké’s genuine, clean record and enabled him to live as Daisuké Taniguchi. Daisuké, meanwhile, wanted to cut himself off from his family. Their agreement rested on a brief but consequential encounter: Daisuké believed Hara understood what it meant to give away a life, and chose to entrust his identity to him.

Background and Motives

Hara’s history made a register exchange an especially consequential choice. He had once been a boxer, had made two suicide attempts, and had previously adopted the identity of Yoshihiko Sonézaki. Daisuké later confirmed that Hara’s identity had changed twice, first to Sonézaki and then through their exchange. In the world of identity trading Daisuké knew, more than one swap was not unusual; a person who had exchanged identities only once was, he said, in the minority.

Sonézaki was nearly Hara’s only possible first exchange partner because of Hara’s past. Hara did not object to Sonézaki’s background as the child of a gangster, but disliked him when they met in person. This personal aversion helps account for the next change: Hara eventually exchanged identities with Daisuké instead. The exchange was not presented as a simple progression toward a more respectable name. It was shaped by the men’s histories, by Hara’s rejection of Sonézaki, and by the possibility that a different identity might let Hara make something of the life he had left.

Daisuké’s motive was to break with his family. He was prepared to exchange with almost anyone, but drew a line at a criminal record and feared that a criminal might devise a scheme to claim the Taniguchi estate. His own identity therefore had practical value: it carried a real, clean history, one attractive enough that another man had repeatedly traded in hopes of acquiring it. Yet Daisuké’s choice was not only a calculation about records and inheritance. After speaking with Hara, he felt that Hara might use the identity well.

The Agreement

The men met only twice. Daisuké recalled that Hara listened carefully to his account and said he wanted to do his best with what remained of Daisuké’s life. That response mattered to Daisuké: if he was going to give his life away, he wanted it to go to someone like Hara. He remembered Hara as pure in the eyes and kind despite everything he had endured, and sensed how strongly Hara wanted to leave his former life behind before his time was over.

Daisuké’s description makes the exchange an act of judgment and trust as well as a transaction. He did not claim a long friendship: their meetings were few. What persuaded him was Hara’s attention to his story and the apparent seriousness of his wish to begin again. Hara, for his part, heard about Daisuké’s life and was understood to have empathized with it. The register passed between them as a means of separation from the past, but the choice of recipient depended on a human encounter.

Life Under the Borrowed Identity

The exchange’s legal force is visible in the life Hara went on to lead as Daisuké Taniguchi. Government officials accepted the identity when they updated the family register following a marriage notification and later a death notification. Hara drove using a license and visited a doctor with a health-insurance card; he also made his pension contributions punctually. These records consistently identified the person living as Daisuké as Daisuké himself, and his account of growing up in Gunma showed no apparent discrepancy.

That official consistency did not make the identity true in the eyes of those who knew the original Daisuké. After the husband’s death, Daisuké’s brother Kyoichi Taniguchi saw a photograph and said the man was not his brother. The documents and the family’s recognition thus pointed in opposite directions: the state had repeatedly verified the borrowed identity, while Daisuké’s own brother recognized the difference between the record-holder and the person it named.

For Rié, the consequences extended beyond the question of her husband’s name. Hara, living as Daisuké, married her and fathered a child, so the exchange became embedded in a family’s legal history. When the truth came to light, Kido petitioned the Miyazaki Family Court to reverse the death entry for Daisuké and remove the false Daisuké from Rié’s register, restoring it under her maiden name, Takemoto. The marriage was to be annulled on the basis of error, erasing the second marriage from the register and leaving Hana legally illegitimate. The identity exchange had enabled a household to exist in law; correcting the record changed the legal status of everyone connected to it.

Registers, Recognition, and Absence

The exchange sits within a wider history in which a family register has served as more than a record of names. The system began under the late-sixth-century Ritsuryo bureaucracy, where it was used chiefly for policing and tax collection. During the Edo period it also helped authorities monitor religious affiliation, and its records came to include details such as birth, marriage, adoption, residence, work, and death. Because the system tied identity to land, the late-nineteenth-century recognition of freedom of movement helped make the old arrangement obsolete; the modern register was then used for purposes including conscription and taxation, giving people reasons to abandon or falsify records.

The novel’s account of the three-hundred-day problem shows the inverse of Hara’s exchange. Under the Civil Code rule described in the story, a child born within three hundred days of a divorce was legally considered the former husband’s child. Some women who had divorced after domestic violence and then had a child with a new partner did not submit a birth notification, leaving the child without a register. Such children could meet the conditions for Japanese citizenship yet remain absent from the state’s knowledge and statistics. Where Hara acquired an identity that officials could repeatedly confirm, an unregistered person could be denied even the basic administrative recognition that they had lived.

That contrast leads Kido to reconsider what may have happened to the real Daisuké. He had first imagined Daisuké surviving under Hara’s identity after their registers were exchanged. But if Hara had originally been unregistered, Kido wondered whether Daisuké might instead have become unregistered in his place. In that case, even a murder could be obscured by the absence of an official identity; a body might be treated as unidentified, and evidence of the person’s existence would have to be pieced together from testimony, DNA, photographs, and belongings. If the tsunami had taken him, even those traces might have disappeared. The exchange therefore opens a question rather than settling the fate of the original Daisuké.

The family register is increasingly supplemented by residence certificates and, as Nakakita explains, could become redundant if tax and social-security records were joined through the My Number system. Kido observes that easier record-linking might also make identities easier to trade; biometrics, in turn, could make the system almost inescapable. Against that prospect, Hara and Daisuké’s exchange reveals the double edge of administrative legibility: records make marriage, death, and public identity actionable, but their authority can also preserve a false identity while leaving another person difficult to find. The transaction matters because a life may be exchanged in the paperwork, but a document cannot establish who actually lived it.