Yoru is a mess. Let’s just start there. When Tatsuki Fujimoto introduced the War Devil in Chainsaw Man Part 2, fans expected a global catastrophe on legs, something akin to the relentless terror of the Gun Devil. Instead, we got a bird-like entity trapped in the body of a high schooler named Asa Mitaka, constantly bickering about school uniforms and social anxiety. But if you think that makes her less of a threat, you’re missing the entire point of how fear works in the series.
Fear isn't just about big explosions. It’s about the psychological weight of what you're willing to lose.
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The Mechanics of Guilt and Weaponization
The War Devil in Chainsaw Man operates on a logic that is uniquely cruel. While the Bat Devil or the Eternity Devil just eat people, Yoru transforms things—and people—into weapons. But there’s a massive catch that separates her from the rest of the Horsemen. The strength of the weapon she creates is directly proportional to the amount of guilt the user feels.
Honestly, it’s a genius narrative move. It forces the protagonist, Asa, into a cycle of trauma where the more she cares about someone, the more "valuable" they become as a literal sword or grenade. We saw this early on with the "Uniform Sword." It wasn't just a piece of fabric; it was a memory of her mother, a symbol of her last remaining connection to a normal life. Because she felt terrible about "wasting" it, the blade was devastating.
This creates a terrifying paradox. To be a powerful War Devil, Yoru needs Asa to be a good person who feels deep empathy. If Asa becomes a cold-blooded sociopath, her weapons become useless. War, in Fujimoto’s world, isn't fueled by hatred alone; it’s fueled by the destruction of things we actually love.
Why Yoru is Desperate to Kill Chainsaw Man
You've probably noticed Yoru has a bit of an obsession. She wants to make Chainsaw Man vomit up the Nuclear Weapons Devil. It sounds absurd, but it’s the core of her identity crisis. In the lore of the series, Pochita (the Hero of Hell) has the ability to erase concepts from existence by eating the devils associated with them. At some point in the past, he took a bite out of War.
He didn't kill her. He just made her weak.
By eating the devils representing the horrors of war—like World War II or the aforementioned nukes—Chainsaw Man effectively lobotomized the War Devil’s power. People in the modern world of the manga don't fear war as much because the ultimate "end of the world" scenario has been erased from their collective memory. Yoru is a shadow of her former self. She’s like a fallen god trying to reclaim her throne, which makes her erratic, impulsive, and incredibly dangerous. She isn't fighting for world peace or even world domination; she's fighting for her own relevance.
The Dynamic Between Asa and Yoru
The "two souls in one body" trope is common in shonen, but this is different. It’s not a partnership like Kurama and Naruto. It’s a parasitic hostage situation. Yoru explicitly tells Asa that if she doesn't cooperate, she'll take over her brain entirely. Yet, as the story progresses, the lines blur.
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We see Yoru start to feel Asa’s emotions. When Asa gets a crush on Denji, Yoru feels the butterflies too. It’s hilarious, sure, but it’s also a sign of "brain rot"—the literal blending of a primordial fear with the mundane anxieties of a teenage girl. This is where the War Devil in Chainsaw Man becomes a truly complex character. She is learning about humanity through the lens of a girl who hates herself.
Debunking the "Weak" Allegations
A lot of readers early on complained that Yoru felt like a "jobber." She lost fights. She got embarrassed. She seemed like a joke compared to Makima (the Control Devil).
But look at the scale of her potential.
In the more recent chapters, especially during the chaos at the Devil Detention Center, we see what happens when Yoru gets a "buff." As the fear of war rises globally due to the conflict between the Chainsaw Man Church and the Public Safety Bureau, Yoru’s power spikes. She can turn entire city blocks into weaponry if she feels enough "ownership" over them.
The concept of "ownership" is the second pillar of her power. She doesn't just need to feel guilty; she needs to believe the object belongs to her. This is a subtle commentary on imperialism and conquest. War doesn't just destroy; it claims. When Yoru claims a person as "hers," they are no longer a human being with agency; they are an asset.
What Most People Get Wrong About the Four Horsemen
The War Devil in Chainsaw Man is one of the four sisters: Control, War, Famine, and Death. Makima was the first we met, and she was terrifying because she was everywhere. Fami (Famine) is terrifying because she is a puppet master. We haven't seen Death yet, though the hype is through the roof.
Yoru is the "black sheep."
While Control wanted to create a "perfect" world by removing suffering, War just wants to exist in her fullest form. She is the most "human" of the sisters in her flaws. She’s prideful, she’s easily offended, and she’s prone to temper tantrums. These aren't just character quirks; they are reflections of how war actually starts. It’s rarely a grand, calculated plan. It’s usually a series of small ego bruises, misunderstandings, and desperate grabs for power that spiral out of control.
The Symbolism of the Scars
Notice the scars on Asa’s face when Yoru takes over. They are a permanent reminder of the first person Yoru killed—Asa herself. Unlike Makima, who looked perfectly human, Yoru carries the mark of her violence. It’s a visual representation of the "scars of war." Even when the fighting stops, the marks remain.
How to Track Yoru’s Power Growth
If you want to understand where the story is going, keep an eye on these three specific indicators:
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- Asa’s Mental State: If Asa starts to feel more attached to her surroundings, Yoru’s potential arsenal grows. The "Room 606 Sword" was just the beginning.
- Public Perception: The news reports in the background of the manga panels aren't just flavor text. When the world starts talking about conflict, Yoru gets faster and stronger.
- The Chainsaw Man Church: This organization is essentially a "fear farm" for the War Devil. By creating conflict in Denji’s name, they are inadvertently feeding the very devil that wants to kill him.
Actionable Insights for Fans and Theorists
If you're trying to predict the next move for the War Devil in Chainsaw Man, stop looking at physical strength. Look at the emotional stakes.
Fujimoto has set up a situation where the "final boss" might not be a giant monster, but a heartbreaking choice. If Yoru needs a weapon strong enough to kill a god, she will eventually have to turn something truly irreplaceable into a blade.
Pay attention to the concept of "Property." Yoru recently claimed she "owned" a certain character's feelings. That’s a massive shift in how her power works. She isn't just taking physical objects anymore; she's weaponizing relationships.
To stay ahead of the curve:
- Re-read the "Aquarium Spear" chapters. It’s the perfect example of how Yoru uses Asa's twisted sense of logic to bypass the rules of reality.
- Watch the background characters. Fujimoto loves to hide the "ownership" triggers in small dialogue bubbles.
- Monitor the Famine Devil’s influence. Fami is clearly using Yoru as a blunt instrument. The real danger isn't just Yoru’s power, but who is pointing her like a loaded gun.
The War Devil isn't just a villain. She’s a tragedy in progress. And in the world of Chainsaw Man, those are always the characters who do the most damage. Stop waiting for her to become "the next Makima." She’s something else entirely: a personification of the messy, emotional, and devastating reality of human conflict. That is why she's the perfect foil for Denji, a boy who just wants to be loved but ends up destroying everything he touches.