Sota

Sota is Akira Kido and Kaori’s young son, whose ordinary childhood scenes expose the novel’s deepest tensions around parenthood, identity, and loss. A question about a mythical transformation, a remembered family vacation, or the name he wants to keep can become a measure of what binds a family together; at the same time, his father’s love for him is shadowed by fear that he may fail, disappear, or pass his own pain on to the child.

Identity and Early Life

Sota is four years old when Kido’s family life is introduced. He lives with Kido and Kaori in their ninth-floor Yokohama condominium, purchased together with thirty-five-year mortgages. The home was arranged with the hope of having a second child, but that plan has not come to pass, and the couple have recently stopped discussing it. Sota’s place in this carefully planned household is therefore both cherished and bound up with an absence the parents no longer speak about.

His early routines are specific and familiar: meals, baths, daycare, bedtime, and illustrated books shared with his father. At dinner, Kido has to keep reminding him to remain in his chair. In the bath, Sota asks why Narcissus turns into a flower, after hearing a children’s retelling of Greek myth at daycare. Kido offers an imaginative explanation, but Sota recognizes that it does not quite answer the question and leaves his father with homework. Later, while they look through an illustrated guide to Ultraman, Kido understands the connection that has caught his son’s attention: Narcissus changes form, as Ultraman does when a human becomes a giant alien. The exchange shows Sota as curious and persistent, and Kido as a father who wants to enter his son’s imaginative world rather than dismiss it.

A Child at the Center of Kido’s Fears

Sota’s importance to Kido is most intense in moments that appear least extraordinary. After the bath and the Ultraman book, Kido falls asleep beside him; remembering the feeling of holding his son’s hand in the dark, Kido is overcome by the fact that he is Sota’s father. The commonplace relation itself feels ecstatic, but Kido recognizes that its force is also the reverse side of anxiety. He imagines that he might one day remember that night as the happiest of his life.

That anxiety sharpens after Kido attends the funeral of a friend who died young. He imagines Sota hearing the news of his own death and being unable to understand it. Kido knows that he could explain death to his son only while alive; he cannot prepare Sota for his absence from within that absence. He wonders how Sota would remember him decades later, when the boy reached Kido’s present age of thirty-eight, and considers the possibility of sudden death in a future Nankai Trough earthquake. Sota is not merely the person Kido loves most: his imagined future becomes the measure by which Kido judges his own life and its possible end.

The contrast between Kido’s tenderness and his fallibility becomes painful when Kaori leaves town on a business trip. Sota has been unsettled since a quarrel in which Kaori scolded him over Kumon math homework and Kido defended him; the disagreement exposed how poorly the parents could discuss child-rearing. On the morning Kido must get Sota ready, the boy watches a Doraemon film instead of eating breakfast or washing his face, and Kido’s impatience grows as an appointment approaches. Believing that he and Sota share a special trust, Kido is unprepared for the child’s resistance—and then responds with anger.

When Sota refuses to put on his socks, Kido throws them at him and strikes or rebukes him on the head. He realizes at once that his hand is gripping the boy’s head, as if he could conceal what he has just done by not withdrawing it. Frightened, Sota stops crying. Kido sees in his own grip the violence he rejects, steps away, and watches Sota put on his socks while sobbing, his face red. He hugs him until the tears stop, takes him to daycare without speaking, and is overcome by sorrow and regret as the child disappears inside. The episode breaks Kido’s comforting assumption that love and mutual trust make him incapable of harming his son.

Names, Memory, and the Double

Sota’s questions also bring the novel’s concern with identity into the home. At bedtime, after hearing a daycare story in which Baikinman pretends to be Anpanman, he asks Kido whether he would recognize Sota if confronted with a double. Kido first says he would know by sight and voice; when Sota presses the case of a double who looks and sounds exactly like him, Kido proposes asking about something only the real boy would remember. Their shared vacation in Hawaii becomes the test. Kido’s answer turns identity away from outward resemblance and toward the particular memories built between two people.

That scene resonates with Kido’s search for the missing Daisuké Taniguchi, whose life is entangled with Makoto Hara’s assumed identity. The child’s simple distinction between a person and an indistinguishable double gives the adult problem a domestic scale: appearance alone cannot settle who someone is, while memory can offer evidence of a lived relationship. Sota does not know the full stakes of Kido’s investigation, but his question gives his father a language for thinking about them.

The issue of identity becomes more personal as Sota grows older. After his mother tells him she intends to return to her maiden name, he finally explains why he has seemed subdued: he does not want to change his own name from Taniguchi. By middle school, that is the name his friends and the younger and older students at school know him by. His earlier transitions—from Yoneda at birth, to Takemoto after his mother’s divorce, to Taniguchi when he began elementary school—make another change feel like being repeatedly asked to correct how others address him. For Rié, returning to Takemoto is a restoration of her own legal identity; for Sota, the same change threatens a name already woven into his daily social life.

His objection also carries grief and loyalty. Sota asks when his mother will make a grave for his father, whose ashes have remained in an urn, and reproaches her for hardly speaking about him. He fears that, after his father’s family turned away from the dead man, the two of them may forget him as well. He asks Rié to let him remain Yuto Taniguchi even when she becomes Takemoto: keeping the name, he insists, is part of refusing to erase his father. The exchange forces Rié to see that his apparent indifference to her announcement concealed a concern she had not understood.

Family Conflict and Growing Attentiveness

Sota’s place in the family is shaped not only by what adults tell him, but by what they leave unresolved. Kido knows that the marital estrangement between himself and Kaori is affecting their son, and he hopes Sota will one day feel certain that he was raised with love. Yet Kido’s anger over the socks demonstrates how easily a child can become the outlet for tension between adults. Sota’s behavior is not presented as a simple verdict on either parent: his resistance follows an unsettled period at home, while Kido’s remorse follows his recognition that he has made that unease worse.

As he grows, Sota becomes attentive to the feelings around him. When the family considers whether to go up the Tokyo Skytree or visit the aquarium, he hesitates, bites his thumbnail, and weighs the options before choosing the aquarium. Kido checks that this is genuinely what he wants, because Sota has learned to notice what adults feel and adapt himself to them. Kido cannot tell whether this is ordinary consideration for a child his age or something particular to his son. The uncertainty matters: Sota’s thoughtfulness is affectionate, but it may also mean he is learning to accommodate the adults rather than simply state his own wishes.

At a restaurant, Kido watches Sota handle a touchscreen with small, deft fingers and notices how closely the boy resembles him in appearance and personality as a child. The resemblance delights Kido, but he cannot turn it into a secure explanation for parental love. He thinks of adoptive parents who lovingly raise children who do not resemble them, and acknowledges that resemblance might someday bring Sota anguish. His imagined examples unsettle any easy idea that a family bond can be reduced to inheritance or likeness. What Kido wants, instead, is to live properly as Sota’s father.

Change and Significance

Sota’s adolescence makes his concerns newly legible to his mother. He is already taller than Rié and has pimples on his cheeks when he finally tells her he wants to keep the Taniguchi name. As he explains, he has moved through several surnames before middle school, while the people around him now know him by one; his attachment to it is at once practical, social, and bound to his father’s memory. The request does not erase Rié’s reasons for reclaiming Takemoto. It asks her to recognize that a parent’s choice of name does not automatically determine a child’s sense of belonging.

When Rié asks what sort of person his father was, Sota reaches an understanding of the kindness he received: he thinks his father did for him what he had wanted his own father to do for him. Rié confirms that this is true, but adds that his father also acted from love for Sota himself. The distinction gives the boy’s interpretation both depth and a necessary correction. His father’s care may have answered an inherited lack, but it was not only compensation for the father’s own childhood; it was also a particular bond with the child before him.

Sota therefore stands at the crossing point of several family histories without being reducible to any one of them. His fatherhood questions awaken Kido’s joy and existential fear; his memory of a shared vacation becomes a test of identity; his chosen surname gives grief a public, everyday form; and his reading of his father’s kindness links one generation’s unmet hopes to the next generation’s care. His childhood is not insulated from adult conflict, but neither is it defined solely by it. In asking what makes a person recognizable, what a name preserves, and why a father is kind, Sota gives the novel’s large questions their most intimate scale.