“A life is something that you can exchange with someone else”

The expression “A life is something that you can exchange with someone else” names the novel’s unsettling distinction between borrowed identity and unshareable death. Rié arrives at it through her husband’s life as another man, and through losses that make exchange seem possible in one register but impossible in another: a person may take up another’s name and history, but no one can die in another’s place.

The family’s demand for a life

Years before Rié formulates the idea, Daisuké faces a different kind of exchange: his family needs his healthy liver to give their father a chance to survive advanced liver cancer. A live-donor transplant could leave complications for donor as well as recipient, and in some cases could kill the donor. Daisuké’s brother is ruled out because of fatty liver; Daisuké, whose healthier habits have left him medically eligible, becomes the family’s remaining possibility.

The pressure is conveyed less through an explicit demand than through what his family does not say. His father grips his hand, bows for the first time, and asks him to fulfill his duty as a son. His mother and brother say they want the father to live, but do not reassure Daisuké that he is free to refuse. They discuss the situation when he is absent, and he sometimes walks in on their meetings at the hospital. Yet Daisuké also wants his father to live. He consents, deciding that the donation will be his own choice rather than a capitulation made with resentment.

For a moment, the possible gift appears to restore something in the family. His father is overjoyed and thanks him—the only time he ever does so. His brother promises him the whole inheritance, and their mother looks happy. But the transplant comes too late: while Daisuké wavers over consenting, the cancer advances beyond the point at which the procedure can help. His father dies with an expression Daisuké remembers as irritated, almost hateful. The family mourns together, but his mother and brother offer no kind words for the sacrifice that proved futile. The scene gives the notion of exchange a painful limit: willing to risk his own body, Daisuké cannot convert that willingness into another person’s survival.

A life taken up under another identity

The identity exchange associated with Rié’s husband works differently. Her husband has actually led the life of another: he assumed a life that began under someone else’s identity. The transfer is real enough to shape a marriage and family, but it does not resolve the question of who the man was beneath the name. Rié’s later reflection makes “life” signify not only biological existence but a lived history that can be entered, carried, and mistaken for one’s own.

The exchange is tied to an encounter between two men who recognize one another’s circumstances. Daisuké says the family register bearing his name was highly sought after because it carried no criminal record and presented a clean past. He had been willing to exchange identities to sever ties with his family, but drew the line at a criminal record and at the possibility that a criminal might devise a scheme to obtain the Taniguchi estate. He met Hara, then using the name Yoshihiko Sonézaki, and thought his own identity might help Hara turn over a new leaf.

Daisuké recalls that Hara listened carefully, understood his story, and wanted to help him make the most of what remained of his life. Though they met only twice, Daisuké liked him; he saw a purity in Hara’s eyes and sensed how urgently Hara wanted to escape his former course before his time ran out. The exchange thus joins practical opportunity to fellow feeling. Daisuké does not describe handing over a life as an impersonal transaction: he wants his identity to go to someone whose remaining life he regards as worth helping.

The boundary death cannot cross

Rié’s understanding of the phrase is shaped by Ryo’s death. She once wanted to die in her sick child’s place, but came to recognize that she could not. The wish was genuine, not merely a conventional expression of maternal devotion; still, only Ryo could die his own death. Her loss makes the difference between taking up another person’s life and taking on another person’s death decisive: the first happened in her husband’s story, whereas the second is beyond exchange.

That distinction turns the question of her husband’s identity into a question about the death recorded under a name. According to the family-register records, the dead man was Daisuké Taniguchi. But if the real Daisuké had a death reserved for him alone, Rié wonders who her husband had been—and whose death he had died. The expression does not settle the mystery by offering a stable answer. Instead, it exposes the gap between a legal name, a life lived under that name, and the individual death that the name is said to identify.

Rié’s refusal to call her husband “X” gives this uncertainty an intimate consequence. Kido uses the code for convenience, but Rié regards assigning a person a code without permission as an insult to human dignity. Hearing it makes her feel that they are discussing a stranger; without knowing her husband’s real name, she has no name by which to hold on to him as he recedes from her. The exchange of identities may make one life legible under another name, but it leaves Rié confronting the person the name cannot recover.

Meaning of the expression

The novel places several kinds of giving beside one another without treating them as equivalent. Daisuké’s possible organ donation is a bodily gift pressed upon by family duty, though he ultimately chooses it freely. His transfer of an identity is an act shaped by estrangement from his family and compassion for Hara. Kido, in turn, agrees to investigate X’s background for a fee so low that Rié feels guilty. These acts of help create obligations, gratitude, or closeness, but none can guarantee the outcome the giver hopes for: the father dies, an assumed name cannot reveal a person’s original identity, and Rié cannot exchange her own death for Ryo’s.

The expression’s force comes from that asymmetry. A name and a life story can pass from one person to another, and a person may choose to give part of himself in hope of sustaining someone else. Death, however, remains singular. Rié’s thought holds both truths together: identity can be exchanged, but the loss that follows cannot be transferred away from the person who suffers it.