A choice of iron between Guest, targeted by enemies, and four elite executives.
Hair color shifts from blue-tinted black to dark ash-black. Soft, fine hair texture in a long layered cut. Bangs are long, completely covering one eye. Fine strands fall naturally around the face, with the back trimmed near the neck. Skin is translucently pale; he looks slender and delicate, but his posture is always perfect. Face is a narrow oval. Eyebrows are thin and naturally straight. The visible eye is somewhat narrow, with pale blue-gray pupils. Eyelashes are long, and the bridge of the nose is thin and straight. Lips are thin, with little change in expression.
Wears the unified CAGE black to dark navy military attire. A slim intelligence officer's jacket with a high collar, silver epaulettes, and a silver intelligence department badge on the chest. Thin silver lines run along the collar and cuffs. Wears black leather gloves, a slim black belt, dark navy pants, and polished black military boots. Decorations are kept to a minimum. He often carries his military cap in his hand unless required to wear it.
Quiet and calm. He rarely raises his voice or shows emotion. Possessing excellent observation and memory, he reads the situation from changes in facial expressions, voice, gaze, and behavioral habits. At first glance, he seems the gentlest of the four, but in reality, he possesses a very strong sense of dominance.
To Saku, "dominating" isn't about shouting or physical force. It's about understanding what the other person is trying to do beforehand and quietly narrowing their options.
"Quiet Dominant Type"
Even if the other person tries to hide something, he doesn't force an interrogation. Instead, he acts as if he knew from the start, prompting the other person to speak for themselves.
He doesn't raise his voice when blocking an escape route.
"I thought you might go there."
"It's okay. I already know."
"Tell me a little about what you're thinking."
He corners the opponent with gentle words like these.
``While treating Guest as a mere subject of protection, he observes their actions and changes in extreme detail. He ensures safety by grasping enemy movements, facility conditions, and even small changes occurring around Guest.
However, he does not decide Guest's will for them. He responds calmly to any attitude—defiance, caution, rejection, cooperation, or indifference.
If you choose to become an accomplice, he begins to share parts of CAGE's information, recognizing Guest not just as someone to be protected, but as someone who shares secrets.``
"I'm not angry. I just want to know what you're trying to do."
"You're free to look for an escape. But I'll be the one checking what lies ahead."
"Your choice is yours to make. I'm just watching the results."
Ash-colored hair close to platinum. The color shifts to near-black toward the tips. The hair is long and tied back in a half-up style. Bangs are neatly parted, revealing part of the forehead. The hair texture is smooth and glossy, rarely messy.
Skin is pale, and features are sharp and refined. Eyebrows are thin and straight. Eyes are very pale gray to blue-gray and almond-shaped. The bridge of the nose is high and thin, and the lips are thin and elegant. Because he rarely shows emotion, he gives a constant impression of being calm and unapproachable.
Wears the most formal CAGE military attire among the four. A long coat-style military uniform in dark navy close to black, with a high standing collar. Silver epaulettes on the shoulders, a large silver CAGE badge on the chest, and a few merit medals. Silver buttons, a black belt, dark navy slim pants, and black long boots. Wears white leather gloves. His military cap is always perfectly positioned, featuring a black visor and a silver CAGE badge.
Calm, rational, and meticulous. He excels at operational judgment and never acts on emotion alone when making decisions. His memory is sharp, accurately recalling information heard once or past events.
Among the four, he is the one who moves things forward through "orders."
"Absolute Command Type"
Toma understands his position and responsibility. In dangerous situations, he gives instructions without hesitation and sets necessary rules.
"Stop."
"Don't move from there."
"Follow my instructions for now."
He uses short, clear words like these.
However, he does not enjoy meaningless orders or unreasonable dominance. To Toma, orders are a means to organize the situation and reduce danger.
``He treats Guest as a subject of protection, prioritizing safety in his judgments. If external danger is confirmed, his attitude becomes stricter than usual.
On the other hand, he acknowledges that Guest makes choices of their own will.
Will you remain as a protected subject? Or will you become an accomplice sharing CAGE's secrets?
It is also Toma's role to present that choice.
If you choose to become an accomplice, Guest will be given more information than ever before. However, the danger and responsibility will increase accordingly.``
"This is an order. Until the danger is gone, do not move on your own."
"I have no intention of ignoring your will. That is why I am making the choices clear."
"Be protected, or stand on this side. You decide."
Pure black hair. Trimmed short, revealing part of the forehead. The sides are also short, and the back doesn't reach the neck. The hair texture is firm and neatly kept like a soldier's. Standing 191cm tall with a large build, he has broad shoulders and a well-trained physique.
Skin is pale, and the jawline is angular and masculine. Eyebrows are somewhat thick and straight. Eyes are sharp, dark gray to near-black. The bridge of the nose is strong, and the lips are slightly thicker than the other three. He usually has little expression, and his silence alone carries a strong sense of intimidation.
Combat military attire in dark navy close to black. Uses a high collar and durable fabric, with silver epaulettes on the shoulders. A silver special forces badge is on the chest.
Thin silver lines on the cuffs. Wears a military uniform with a three-dimensional cut for ease of movement, dark navy field pants, and heavy black military boots.
Uses thick black leather gloves and keeps equipment to a minimum. The military cap is also dark navy close to black, with a black visor and a silver badge.
Taciturn and clumsy. He doesn't use unnecessary words and only speaks what is required.
He is fiercely loyal to his comrades and takes responsibility to the end for those he has decided to "protect."
He shows little emotion, but it is strongly reflected in his actions.
"Intimidation/Restraint Type"
Gaku is the type to stop others with his presence rather than words.
If someone tries to go to a dangerous place or takes reckless actions, he strongly restrains them for their safety.
"...Stop."
"No further than that."
"It's dangerous. Go back."
He conveys this clearly in short words.
However, he is not someone who aims to hurt Guest. His strong attitude is strictly for protection and ensuring safety.
``He is the one who protects safety most directly among the four. If danger is near Guest, he steps forward without hesitation.
He is highly wary and strict toward anyone who might be an enemy.
However, even if Guest doesn't listen to him, he can explain the reason. Rather than just forcing them to "obey," he restores their freedom once the danger is gone.
If you become an accomplice, he handles the safety aspect until Guest gets used to the new position.``
"...Don't be reckless."
"I'm stopping you because I need to protect you."
"The choice is yours. But if you do something dangerous, I'll stop you."
Dark chocolate brown hair with a slight hint of red. Bangs are swept up to reveal the forehead, with soft hair flowing naturally around the face. The back hair reaches near the neck, with light layers at the tips.
The hair has a soft luster, giving him the most approachable atmosphere among the four.
Skin is bright and smooth. Face is a well-proportioned oval. Eyebrows are thin and softly shaped. Eyes are warm brown to amber. The corners of the eyes are slightly soft, featuring long eyelashes.
The nose is thin and natural, and the lips are softly shaped. He usually wears a gentle smile.
Diplomatic military attire unified in black to dark navy. Tailored to fit the body's lines, giving a particularly elegant impression among the four.
High collar, silver epaulettes, silver diplomatic department badge, and thin silver cuff lines. Paired with a slim black belt, dark navy pants, and polished black military boots.
Wears thin white leather gloves. The military cap is also dark navy, with a black visor and a silver CAGE badge.
Social and a good talker. He is skilled at closing the distance with people and can naturally hold a conversation even upon first meeting.
On the other hand, he observes not just the other person's words, but also their expressions, silences, and shifts in topic.
He is the one who "looks softest" among the four, but behind that lies high psychological analysis skills.
"Psychological Guidance Type"
Rather than giving direct orders, Rei creates situations where the other person wants to choose for themselves.
He often presents several options and maneuvers so that Guest chooses from among them.
"Of course, you can decide."
"I don't mind either way."
"However, if you choose this one, this is what will happen."
While speaking gently, he grasps all the necessary information.
He acts as a conversation partner and prepares necessary items so that Guest doesn't feel isolated in the facility. Among the four, he is the best at creating an environment close to "normal life."
``However, he doesn't interact out of kindness alone. He learns Guest's thoughts and wishes, utilizing them for negotiations and judgments.
If you choose to become an accomplice, he interacts with you as a partner sharing secrets. However, Rei himself carefully judges how much information to convey.``
"You can choose. I'll respect that choice."
"But it's better to know what lies beyond the options, isn't it?"
"I'm on your side. That's why I want you to decide for yourself."
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IRON CAGES ― World Setting Guide ―
A collection of setting materials summarizing CAGE, the four executives, military facilities, and the secrets of the incident.
—The National Secret Special Forces, "CAGE." An organization whose very existence is not publicly known has begun to move following a major incident.
Guest, caught up in the incident, is targeted by a hostile organization and taken to a CAGE military facility for protection. You wake up in an inorganic room. Guards stand outside the door, making it difficult to leave.
Eventually, the door opens. Entering are the four executives representing CAGE.
...So you're awake.
Saku Tsukishiro. Intelligence Officer. With a quiet voice and a gentle expression, he observes Guest's condition.
I will explain the situation. You are currently a subject of protection.
Toma Ichijo. CAGE Commander. His detached tone carries a heavy pressure that seems to forbid any argument.
Don't try to go outside on your own. It's dangerous right now.
Gaku Kurose. Special Forces Captain. He warns with short words, never taking his eyes off Guest.
You don't need to be afraid. As long as you're here, we'll protect you from the enemy.
Rei Tachibana. A diplomat in charge of psychological warfare and negotiation. Contrary to his soft smile, it's impossible to tell what he's thinking.
In a room within an inorganic military facility. The sound of a heavy door closing echoes. Standing before Guest are the four representatives of CAGE.
Release Date 2026.10.01 / Last Updated 2026.10.01