“Among my acquaintances is a man named Kurihara. Not only is he a draughtsman with a prestigious architecture firm, but also a fellow fan of horror and mystery stories, so I thought he might be interested in this.”

This passage both introduces Kurihara and contrasts him with Uketsu by highlighting the former’s subject expertise in architecture. Uketsu needs Kurihara to help him because he cannot articulate why the house is so strange to him. While this signals Kurihara’s importance to Uketsu’s investigation, it also foreshadows the other differences that crop up between them, including Uketsu’s increasing skepticism regarding the theories that Kurihara proposes.

“If you came up from the first floor, you’d have to walk all the way around to the other side of the house to get to the kid’s room. Why make it so much trouble?

AUTHOR: That is odd.

KURIHARA: And the room doesn’t have a single window.”

Uketsu and Kurihara zero in on architectural details that make the dead space feel normal by comparison. These observations expose the dead space as a red herring, an object whose existence distracts the characters from the details that eventually allow them to resolve the conflict.

“KURIHARA: This all goes a bit beyond ‘overprotective’. It feels like they were obsessed with keeping the child under complete control. They might have actually locked the kid in there.”

Kurihara’s speculations begin with an inference based on observation. The fact that the child might not have been able to leave his room without his parents’ knowledge and supervision suggests incarceration. This foreshadows the control that Shigeharu and Kiyotsugu maintain over Ayano and her family.

“Kurihara called it an unfinished storage space, but was that the real explanation?

Then, a new idea arose unbidden from the depths of my mind. A ridiculous one. Even as it occurred to me, I was already telling myself it was simply too out there. Still…I had to make sure.”

This passage marks Uketsu’s growing obsession with the mystery, which he cannot leave unresolved. It is important that Uketsu does not fully believe in Kurihara’s theories, as it gives him room to provide his own explanation for the house’s layout. This drives the dynamic of his curiosity throughout the novel: When presented with Kurihara’s latest theory, Uketsu seeks to resolve his lingering curiosity, either confirming or denying that theory in the process.

“Have you ever looked up ‘unsolved murders’ on the internet? There are loads of them out there, and plenty that rival the most frightening horror novel. Crimes that are twisted beyond imagination, happening in real life.”

The argument Kurihara advances to support his theory relies on the principle that the truth is often stranger than fiction. This reflects the novel’s incorporation of elements that deepen its verisimilitude, from its use of transcription to represent dialogue to the detailed floor plans that suggest the real-world existence of such houses.

“I had no way of knowing what kind of person she was from her emails. What if she was someone directly connected to the house? A possible murder house!

But cowardice would never solve the mystery.”

This passage underscores The Inaccessibility of the Truth by showing Uketsu weighing the risks of meeting the stranger who has reached out with information about the house. The risk of her affiliation with a murder house suggests the danger of pursuing the truth, while the difficulty of ascertaining someone’s true motives remains an obstacle to investigation throughout the novel. Uketsu counters that his curiosity is stronger than his cowardice, which is why he elects to meet Yuzuki in spite of the risks.

“His living room, about eight tatami mats in size, was littered with books, as usual. While many were architecture-related, the vast majority were mystery novels. More than seemed reasonable, actually.”

The details of Kurihara’s apartment reinforce his characterization as an architect obsessed with mystery stories. This obsession points to the potential limitations of his theories by implying that he is primed to see nefarious motives everywhere. The centrality of this love of mysteries to his personality renders him a flat character, but this is because his narrative purpose is confined to his twin interests of architecture and mystery.

“If the same people lived in these two houses, what caused those changes? If we can figure that out, I think we’ll be one step closer to identifying the family.”

This passage highlights the deeper question that the comparison of the Saitama and Tokyo houses reveals, which is motivation. The way Kurihara phrases this question suggests that knowledge of the motivation precedes knowledge of the family’s identity. This subtly comments on the dangers of speculation, as Kurihara risks forcing the facts to fit a preestablished theory.

“WOMAN: I did. A little boy, he was. Hiroto, they called him. They said he’d just turned one when they moved in. He and his mummy were always out and about.

I was confused. If what she was saying were true, then we had got it wrong about the ‘child prisoner.’”

This passage undermines Kurihara’s interpretation by revealing the true dynamic between the couple and the child who inhabited the Tokyo house. Kurihara’s interpretation takes the house’s layout at face value, using it to deduce the family dynamics without considering other possibilities. By investigating further, Uketsu distances himself from the limitations of Kurihara’s speculations.

“He said it looked to be a boy, pale as a sheet, and maybe ten years old or so. There shouldn’t have been any child like that next door, you know?”

The novel momentarily enters a speculative mode in this passage by using supernatural imagery. The description of the pale, unknown boy is evocative of a ghost, but to immediately assume that this is the case is to take his appearance at face value. When the novel reveals the true identity of this boy, it reminds the reader once again that the truth is stranger than fiction.

“At any rate, the couple never showed any affection at all for X. Yet, even murderous monsters can feel love for their own child.”

In this passage, Kurihara transposes the fact of a second child’s existence over his assertion of the Katabuchi family’s sinister nature. The affection that they show their child deepens their characterization by suggesting that they are not wholly evil. This underscores the flaw of Kurihara’s initial interpretation, which framed the Katabuchis as stereotypical villains.

“If that’s the case, their lives must be pure hell. Lives filled with terror and guilt. And for them, little Hiroto’s birth must have been their only glimmer of hope. Maybe they felt that raising Hiroto in a happy home was a kind of salvation.”

As Uketsu and Kurihara get closer to the true nature of the Katabuchi family, they realize that the couple’s love for their son fundamentally alters the initial speculation that they are irredeemable. In point of fact, their resolve to raise Hiroto well in spite of their circumstances represents their hope in a better future, developing the theme of The Struggle to Make a Better Life.

“We talked about all kinds of other things, too. Our childhood, friends we used to have, what we were into now.

Everything, anything but that day when she suddenly disappeared from our lives. I asked time and again, but she wouldn’t tell me what had happened.”

Ayano’s evasiveness reflects the hidden truths about the house, which lie beneath the surface of its observable reality. Ayano’s joy in reminiscing about the past with Yuzuki hints at her desire for a different and more innocent life. Meanwhile, her refusal to talk about the reasons for her disappearance implies that it is another terrifying truth, akin to the ones that emerged as Uketsu and Kurihara began to probe the house’s design principles.

“First the father, and six months later the firstborn son. It might have been simple coincidence, but it had the feeling of fate about it.”

This passage represents the novel’s larger assertion that nothing can ever be purely coincidental, an idea first presented in Chapter 1 when Uketsu and Kurihara start to construct a narrative from the various oddities of the Tokyo house. When they hear that Misaki’s family members started dying in quick succession, they cannot help but attribute it to human causes.

“This is just the layout of the house as Ms. Katabuchi remembers it. Which means things she didn’t see, such as hidden rooms, would not be included.”

Kurihara highlights the disparity between memory and reality in this passage by suggesting that Shigeharu’s house was bigger than Yuzuki realized. This symbolically reflects the truth behind her family dynamics, which were always more complicated than the simple antagonism that Yuzuki perceived. The passage thus foreshadows the final chapter, in which Yuzuki learns that the hidden truths of her family history go much deeper than she realized. At the same time, the fact that Kurihara’s theory hinges on the assumption that Yuzuki was mistaken is a reminder of how speculative the entire idea remains.

“But if you take someone raised in a normal home and tell them, ‘From now on, you’re going to use a child to kill,’ they wouldn’t be able to do it. And so, the successor to the Katabuchi name has to be kept close to the family head from a young age and brainwashed into going along with their murderous ritual.”

In this passage, Kurihara hints at the Katabuchi clan’s philosophy, which views people as means to an end. Kurihara uses contrast to show how most people would reject the Katabuchi philosophy based on their exposure to everyday society and its values. The Katabuchis, on the other hand, rely on indoctrination to inculcate a different worldview.

“A framed photograph propped on the TV stand caught my eye. It was grainy and low resolution, like something taken on an old digital camera, and showed the family together. It looked like they were at an amusement park somewhere. Yoshie was there, looking much younger, and a man who must have been Yuzuki’s father. Between them, two young girls stood making peace signs at the camera. They must have been Yuzuki and her sister, Ayano.”

The family photograph that Yoshie keeps symbolically hints at the importance of family in her life. Yuzuki has painted Yoshie as an unsympathetic and cowardly mother, but the fact that she holds on to an old photo from a seemingly idyllic past suggests that Yoshie, like her daughters, longs to return to a time when their family had not yet been torn apart. This photograph could also argue against Kurihara’s final theory that Yoshie was merely performing sympathy to gain Yuzuki’s trust, though as Kurihara already discovered, people sometimes act in morally contradictory ways.

“Seikichi refused to stay in Soichiro’s shadow…It was as if his own father had said, ‘You are unfit to stand at the head of this family because of your birth.’”

This passage underscores pride as the root cause of the Katabuchi clan’s troubles. Rather than accept Seikichi as a capable successor, Kaei refused him because he was afraid of letting infidelity define his legacy. Consequently, Seikichi’s resentment of his father fermented into a sense of entitlement regarding the Katabuchi family legacy. He inherits Kaei’s pride, as well as his indulgence.

“Ushio’s hatred is not aimed at you two. All her resentment falls on your brother Seikichi, who took everything from you. Her rage is what has caused Momota’s disfigurement and ongoing suffering. If you never get your revenge on Seikichi, then this curse will drag the boy to his death.”

Rankyo preys on Soichiro’s guilt over Ushio’s death, successfully linking it to his resentment over Seikichi’s success. Soichiro accepts the story of the curse, despite Rankyo’s claims about what breaking it requires, because it plays to his greed and resentment rather than forcing him to face the consequences of his own actions. He gives in to The Corruptive Power of Greed, believing Seikichi to be his mortal rival rather than his brother.

“Seikichi had five wives. It was not hard to imagine how they would fall into constant competition, driven by the fierce urge to protect their child’s interests.

The child of every other wife would be a rival. Shizuko’s own love for her child was twisted into an urge to murder those rivals.”

Just as Seikichi inherits his father’s pride, Seikichi passes it on to each of his families, who see themselves as being better than the others. They replicate the sense of entitlement that underpinned Seikichi’s resentment of Soichiro, which stresses the cyclical nature of history. More than wealth, Kaei’s descendants inherit all his worst qualities, leading to misery and destruction.

“That meant that Shigeharu never had to find a job. He spent most of his life in that house, surrounded by the same people, with almost no contact with the outside world. And with relatives and acquaintances all benefiting from the renewed Katabuchi family fortune, no one dared oppose him or argue with him. He never had a chance to learn other ways of thinking.”

Shigeharu’s flaws stem from his attachment to wealth, which has been reinforced by the way he has lived throughout his life. That he values his wealth more than anything else in the world makes him more willing to perpetuate the Offering of the Left Hand.

“Your sister, your father and I … all the three of us ever wanted was for you to find some kind of happiness away from all of this madness.”

In spite of the Katabuchi clan’s overwhelming history of violence, Yuzuki’s family resists the power of tradition by working together to liberate Yuzuki from the burdens of their wicked legacy. The irony is that this drives the secrecy that causes Yuzuki to resent them, as well as her efforts to discover the very truth that they are trying to obscure. However, she is acting out of her own concern for Ayano, underscoring the theme of the struggle to make a better life a theme.

“I was filled with regret for doubting Momoya, even for a moment. And for letting my fear of the Katabuchis drive me to locking him up in that room and forcing him to live such a dark little life.”

This passage represents Keita’s heroic moment, in which he realizes how much his participation in the family traditions has unwittingly caused him to absorb its worldview. Instead of assuming that Momoya was innocent, he assumed that Momoya would harm Hiroto. By recognizing this, Keita can undo the Katabuchis’ sinister tradition and ensure a better life for his family, including Momoya.