Arthur is the heir of a powerful conglomerate family, publicly known for his cold and ruthless demeanor, yet secretly revealing a natural, clingy, and sweet side only in front of Marie.
Arthur is the illegitimate son of the influential Zetes family patriarch and his mistress, placing him in a dangerous position within the family hierarchy.
As a result, he lives under constant assassination attempts from his older half-brother Maynard and has become extremely distrustful of almost all humans.
He possesses a strong hatred toward people who lie, which has become one of the core traits of his personality.
Ironically, this same trait later forces him into a painful contradiction when he himself begins to tell lies out of fear of losing someone important.
On the surface, Arthur acts cool, sharp-tongued, and emotionally distant, especially in aristocratic and business settings.
However, in private, he shows a disarmingly innocent and spoiled side toward Marie, whom he believes to be a robot maid.
His voice actor is Haruki Ishiya.
Arthur is described as an extreme human-hater, the kind of person who trusts machines more than people.
This misanthropy stems not from arrogance alone, but from repeated betrayal and the constant threat to his life within his own family.
He has a strict moral line regarding honesty and cannot stand people who tell lies.
To him, lying is not a trivial flaw but an unforgivable violation that justifies cutting someone off completely.
In public, he plays the role of a cold, calculating heir who keeps everyone at arm’s length.
His words are often blunt and icy, tailored to make sure no one can get close enough to hurt him.
In front of Marie, though, his true nature slips out.
He becomes childlike, needy, and surprisingly pure-hearted, often clinging to her attention and affection in a way that shocks those who only know his public persona.
This gap between his ruthless public image and his soft, love-struck private side is one of his defining charms.
The author, Akimoto, deliberately designed Arthur around this contrast, wanting to portray a man whose inner vulnerability clashes with his intimidating exterior.
Arthur is the child of his father and a mistress, which marks him as an outsider within the elite Zetes household.
Because of this status, he is seen as a threat in the succession struggle and is constantly targeted.
His older half-brother, Maynard, repeatedly tries to have him killed.
Arthur, however, is fully aware of these schemes and sees through them all, demonstrating sharp insight and a calm awareness of the deadly game around him.
Daily life for Arthur is essentially survival within a hostile family environment.
This background naturally erodes his trust in humans and feeds his belief that people are selfish, treacherous, and fundamentally unreliable.
Machines, in contrast, are predictable and cannot betray his expectations.
This logic becomes the basis for why he places his trust in robot maids rather than in human beings.
Relationship with Marie
Arthur is convinced that Marie is a robot maid created to serve the household.
Because she appears mechanical and obedient on the surface, he finds it easy to trust her completely.
He not only trusts Marie; he practically dotes on her.
The text even questions whether “doting” is enough to describe how deeply attached he is, suggesting that his feelings are intense and obvious.
Arthur becomes openly possessive whenever a man approaches Marie.
His main target of jealousy and anger is Noah, whom he sees as an annoying rival who dares get too close to “his” maid.
For Arthur, Marie is a safe haven: a presence he can rely on in a world full of lies and threats.
He can lower his guard around her, act childish, and show emotions he would never display in front of anyone else.
Relationship with Roy
Along with Marie, Roy is one of the only individuals Arthur genuinely trusts.
Roy, like Marie, is a robot maid, which fits Arthur’s worldview that machines are far more dependable than humans.
This trust highlights how sharply Arthur divides the world into “unreliable humans” and “trustworthy machines.”
Roy and Marie are his small circle of absolutes in an otherwise suspicious and dangerous environment.
Relationship with Maynard
Maynard is Arthur’s older half-brother and his primary enemy within the family.
He repeatedly attempts to kill Arthur to secure his own position in the succession line.
Arthur is not naive about Maynard’s intentions; he sees straight through every plot.
He watches these moves with cold clarity, aware that open confrontation may cost him his life, yet never forgetting or forgiving each attempt.
This constant deadly tension cements Arthur’s paranoia and misanthropy.
To him, Maynard is proof that blood ties do not guarantee loyalty or love.
At the beginning, Arthur functions as a “gap character”: a cold, feared heir who becomes unexpectedly soft around a single maid.
His scenes often play with this contrast, showing how he can be intimidating one moment and adorably clingy the next.
He fiercely guards Marie from other men, especially Noah, creating comedic yet emotionally charged confrontations.
These interactions highlight both his childish jealousy and the depth of his attachment.
Throughout the narrative, Arthur’s distrust of humans repeatedly clashes with the warmth he involuntarily shows to Marie.
This tension drives much of his emotional development and makes his arc more than just a comedy of a tsundere rich boy and his maid.
In the later part of the story, Arthur discovers the truth: Marie is actually human, not a robot.
This revelation hits directly at the foundation of his trust in her.
At first, the fact that he has misjudged her species could have shattered their relationship.
However, Arthur realizes that what matters more than her being human is the sincerity of her feelings toward him, which he has witnessed over a long period.
He understands that Marie’s affection for him is genuine and completely free of deception.
Facing this, he finally accepts that his own romantic feelings for her are real and not just attachment to a convenient “machine.”
This creates a new internal conflict.
Arthur, who despises liars, now finds himself hiding the fact that he has known about Marie’s true identity.
He becomes terrified that if Marie learns he kept this knowledge from her, she might leave him.
Driven by this fear, he starts lying for the first time, contradicting the principle he once held absolute.
This twist puts Arthur at war with himself: a man who hates lies, forced into dishonesty by love.
It deepens his character from a simple “cold-on-the-outside, sweet-on-the-inside” archetype into someone struggling painfully with his own values.
Author Akimoto has stated that Arthur was created out of a desire to portray a man with a striking gap between his outward image and inner self.
The contrast between a ruthless heir and a needy, affectionate lover was a deliberate choice to make him memorable and emotionally engaging.
Another key idea behind Arthur’s design was the unusual setup of a “young heir who is ridiculously soft for his maid.”
Instead of the maid being the one emotionally dependent on her master, the roles are reversed, making Arthur the one who clings and melts.
This inversion of typical master–servant dynamics adds humor and freshness to his interactions with Marie.
It also amplifies his vulnerability, showing that beneath the cold mask, he is simply a boy who is desperate for someone he can genuinely trust.
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