王の獣～掩蔽のアルカナ～

OU NO KEMONO: ENPEI NO ARCANA

MANGA

STATUS
COMPLETE
VOLUMES
18
RELEASE
January 24, 2025
CHAPTERS
68

DESCRIPTION

In this kingdom, Ajin are considered no better than beasts. The men are sent to war, the women serve in brothels. Those who are lucky enough to live to old age spend their last years doing degrading, menial work. Boys who show signs of magical ability must serve the imperial family in the palace. Rangetsu's twin brother is sent to the palace to serve the Prince Tenyou, but he only lasts a short time before he is murdered. Rumors say his master was the one who aimed the blade, and Rangetsu decides to puts aside her femaleness in order seek revenge. After years of excelling on the battlefield, she has finally found her way to Prince Tenyou's side. But he isn't what she expected, and the webs of intrigue in the palace is more tangled and venomous than she imagined. Can Rangetsu find her vengeance before she too falls prey to palace plots, and will her inconvenient feelings for the Prince Tenyou be a hindrance or a help?

(Source: Viz Media)

CAST

Rangetsu Ko
Tenyou

CHAPTERS

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REVIEWS

shojoseireader
95/100
Great characters, deep themes, political intrigue, sensual romance, high-stakes drama—this story has it all!
I absolutely love The King’s Beast! From the very first chapter, I was hooked by the stunning artwork and the emotional depth of the story. Rangetsu is such a strong, determined protagonist, and I love how she disguises herself to infiltrate the imperial court and uncover the truth behind her twin brother’s death. The way she carries so much pain but still pushes forward makes her such an easy character to root for.

The male lead, Tenyou is now one of my favorites. He’s one of those rare male leads who isn’t just kind and compassionate—he’s also wise, funny, and incredibly aware of his own privilege as a prince. Instead of simply sympathising with the plight of the Ajin, he actually uses his power to make real, active change for their betterment.p, which is something I don’t see often enough in stories like this. He doesn’t just exist as Rangetsu’s safe haven—he moves the plot forward in a meaningful way. His kindness doesn’t make him weak either; he’s intelligent and perceptive, and the way he navigates the politics while keeping his ideals intact makes him such a lovable character.

Then there’s Kougai, the second prince, who adds another layer of intrigue to the story. He’s got that cold, calculating presence that makes him seem untouchable, but there’s definitely more to him beneath the surface. He has a much more questionable introduction. But as the story progresses, we get to see a more complex side of him, and his bond with Tenyou adds so much depth to both of their characters. He’s smart, reliable and hilarious. I love his interactions with Tenyou and Rangetsu.

Taihaku is another standout—he’s Tenyou’s loyal aide, and while he doesn’t always take centre stage, he plays an important role. His sort of strict, steady presence contrasts with Tenyou’s kindness and Rangetsu’s impulsiveness made their dynamic so funny. I love that tho he grew protective and fond of her, he never crosses the line. No love triangle yay!

And the rest of the cast are all so fleshed out too. So great characters— checked! Next, the plot and themes.

One of the things that makes The King’s Beast so compelling is how it weaves political intrigue and deep, thought-provoking themes into its story. It’s not just about personal revenge or romance—at its core, this series is a powerful exploration of oppression, power struggles, and systemic inequality.

Ajin are treated as lesser beings, used as tools rather than people. They have no rights and are forced into servitude or dangerous roles. Rangetsu’s journey is a direct response to this injustice, showing the deep-rooted discrimination in the empire. Even within the royal family, some, like Tenyou, reject these beliefs, while others uphold them to maintain power.

Another major theme is the idea of justice and whether true change is possible within a corrupt system. Rangetsu is driven by personal revenge, but over time, her perspective broadens—she starts to realise that the problem isn’t just one death but the entire system that allows such injustices to happen. Tenyou, on the other hand, wants to reform the system and build a long term change.

Lastly, Identity is a major struggle in The King’s Beast, especially for Rangetsu and her twin, Sogetsu. Both are forced to change who they are—one to survive, the other as a result of trauma.

Rangetsu disguises herself as a man to infiltrate the imperial court, knowing that as an Ajin and a woman, she would be powerless otherwise. This comes at a cost—she suppresses her emotions, femininity, and even parts of her identity to maintain her cover. The scene where she broke down when she could finally tell someone she’s a girl was so powerful and relevant.

Unlike Rangetsu, Sogetsu didn’t get a choice. His mind fractured due to the abuse he suffered, creating a a different personality to survive. His story is heartbreaking—and the way it explored him developing a split personality and his healing was so incredible.

Aside from the characters, political themes, plot, romance, I also loved the suspense and high stakes scenes. Chapter 60-69, the arc about the war was soooo emotional and good!!! This series is on going, so will definitely revise or add on this review as I read but so far, I really am loving it. I can talk about it for days.

Random thought: this would be an AMAZING anime istg
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