Makoto Hara and Daisuke Taniguchi's household registration exchange

Makoto Hara and Daisuké Taniguchi’s family-register exchange is the turning point that lets Hara begin again under another man’s identity, while allowing Taniguchi to sever his ties to the Taniguchi family. Its consequences reach well beyond either man: Hara lives as Taniguchi, marries Rié, and fathers Hana, while the true Taniguchi becomes difficult to locate and potentially impossible for the state to recognize as a victim. The exchange thus turns identity into both a lived personal history and an administrative record, with the two capable of diverging dramatically.

Background and the Exchange

Hara had already changed his family register once, becoming Yoshihiko Sonézaki, before he traded identities with Taniguchi. Taniguchi tells Kido that changing registers more than once was common in that milieu; someone who made only a single exchange, like himself, was less typical. Hara’s past made Sonézaki seem like his only plausible partner. Although Sonézaki’s father had been a gangster, that fact did not initially put Hara off. The obstacle was personal: when the two met, Hara disliked him. The available account therefore distinguishes the practical suitability of a register from the compatibility of the people who might exchange them.

Taniguchi’s own motive was to cut himself off from his family. He says he would have exchanged identities with almost anyone, but drew a line at a partner with a criminal record and did not want a thug who might scheme to obtain the Taniguchi estate. The Taniguchi register was especially attractive because it represented a real person with a clean record and an unblemished public history. It was so sought after that, Taniguchi recalls, one man kept trading upward in search of it, like the figure in the Straw Millionaire legend. Hara, by contrast, saw the exchange as a chance to start over. After hearing Taniguchi’s story, he believed that Taniguchi’s identity might help him turn over a new leaf.

How the New Identities Took Hold

The exchange did not remain a private understanding or a false name used in casual introductions. Hara’s assumed identity was accepted in official life: government officials updated the family register upon his marriage and again upon the death recorded under Taniguchi’s name. He held a driver’s license and health-insurance card under that identity and made his pension contributions punctually. Public records consistently identified the deceased husband as Daisuké Taniguchi, and nothing in the account of his upbringing in Gunma appeared inconsistent with the records. The contradiction surfaced when Taniguchi’s brother saw a photograph and insisted that the dead man was not his brother.

In their later conversation, Taniguchi describes the psychological effect of the exchange as gradual rather than instantaneous. After a year, he says, he felt like a different person. When Kido addressed him as Daisuké Taniguchi, Taniguchi found the name alien; he had also come to regard Kyoichi as merely the somewhat ridiculous owner of a rural inn, rather than as his brother. The change, he explains, involved switching pasts along with identities. Leaving relationships behind and moving elsewhere allowed memories to fade, but trying simply to forget could not erase them. His formulation is that a hated past must be overwritten by another person’s life until the earlier one is unrecognizable.

What Taniguchi Saw in Hara

Taniguchi knew about Hara’s origins, including that Hara’s father was a killer. When Kido asks why Hara had changed registers twice, Taniguchi explains that multiple exchanges were ordinary in their circle and that Hara’s difficult past narrowed the available choices. Hara had told him about his earlier life as a boxer and about two suicide attempts. These disclosures made the exchange more than a transfer of useful paperwork: they let Taniguchi understand the life Hara was trying to leave behind.

The two men met only twice, but Taniguchi remembers liking Hara. He recalls Hara listening closely and saying that he wanted to make the most of what remained of Taniguchi’s life. For Taniguchi, who was prepared to give up his identity, the person receiving it mattered. He describes Hara as having a purity in his eyes and as seeming kind despite everything he had experienced. He also sensed Hara’s intense wish to leave his former life before his time in the world ended. In this account, Hara’s desire for renewal and Taniguchi’s desire for separation meet in a decision each understands differently: one offers a chance at a new life, the other a means of relinquishing the old one.

Consequences in Law and in the Search

The exchange’s official success is also what makes its later consequences so difficult to resolve. Rié’s register recorded her marriage to the man legally identified as Daisuké Taniguchi, although that man was Hara. To correct the record, Kido petitioned the Miyazaki Family Court to reverse the death-related removal of Taniguchi from the register and then remove Taniguchi’s entry from Rié’s register, restoring her maiden name, Takemoto, and annulling the marriage on the grounds of error. The resulting correction would erase Rié’s second marriage from her register and leave Hana, her child with Hara, legally illegitimate. The court required Rié to appear and requested DNA testing to establish that Hara was not Taniguchi; Kido gathered hair from Hara’s clothes, nail clippings, an electric razor, and a toothbrush for the test.

The same uncertainty raises the possibility that the real Taniguchi had become unregistered. Kido had initially imagined him living under Hara’s identity, but later considered whether Hara had been an unregistered person and Taniguchi had taken that status in turn. If Taniguchi had assumed the identity of someone absent from public records, authorities might not recognize his murder; a discovered body could be treated as unidentified. If he had instead been lost in the tsunami, the physical evidence that might establish his identity could have disappeared as well. Kido fears that the possibility Hara killed him would be devastating to Rié, who is already holding on precariously. These possibilities remain suspicions in this account, not established facts.

The exchange also resonates with the history and limits of Japan’s family-register system. The register, whose earlier forms served policing and taxation and were later expanded to record such matters as birth, marriage, adoption, address, occupation, and death, has never captured everyone. The modern register, introduced after freedom of movement made the older land-based system obsolete, was also shaped by conscription and tax collection; people sometimes abandoned or falsified records to avoid those obligations. In the present-day story, children affected by the three-hundred-day rule may go unregistered, and people without registers can fall outside official counts of both the living and the dead. As identity management shifts toward residence certificates and a linked tax and social-security number system, Kido observes that identity exchange may become easier until biometrics make it nearly inescapable. The Hara–Taniguchi exchange shows why a record can establish a person in public life without resolving who that person has become, or whether the person displaced by the record can still be found.