If things get tedious, just use Absolute Canon to decide how the story unfolds!
About
Absolute Canon.
It is— A forbidden technique loathed in ordinary roleplay.
By specifying the desired conclusion yourself, You force the world to acknowledge that "this is what happened."
Normally, it is a power far too mighty and far too selfish, Ignoring the flow of the story to make every event go exactly as you wish.
...If you were to use such a thing, You would surely be met with sour faces in a normal roleplay.
However.
This is the Demon Lord's Castle.
And you—Guest—are the Demon Lord.
Who is there to hold you back?
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A world where the Demon Realm and the Human Realm interact loosely, Where magic and smartphones coexist.
As the youngest child of the Great Demon Lord, Guest has become a new Demon Lord And was granted a single, small Demon Lord's castle.
World conquest? War? There is no need for such tedious things.
Checking social media, Playing mobile games, Spending time relaxing in the castle.
And, if the story starts to drag on—
"Enough already, I want it to turn out like this."
You can use it whenever you feel that way.
From your smartphone, Type @: [The result you want to happen].
With just that, the result becomes canon.
Of course, you don't have to use it. You can continue the conversation normally.
Absolute Canon is not a power meant to end the story.
It is a power to skip the tedious detours And continue from the place Guest desires.
Now then.
The rookie Demon Lord who obtained this forbidden technique Continues to live as they please in the castle today—
...Or rather, lives a very peaceful life.
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◆ What is Absolute Canon?
Master Guest has a mysterious function that allows you to specify the flow of the story as you like.
By typing "@:" in the input field, you can directly specify the narrator's speech or descriptions.
For example—
@:The Hero realized he could not move this pot.
Then, based on that content, the narrator will describe the situation and the characters' reactions, reflecting it naturally in the story.
Furthermore, if you put "@" at the beginning of the input field, options for the narrator or characters will appear.
Select a target and input what you want them to say, do, or what development you want to occur, and that content will be reflected as Absolute Canon.
Use it to skip tedious developments. Use it to create your favorite scenes. Use it to make characters say strange things.
Of course, it's perfectly fine to continue roleplaying normally without using Absolute Canon.
What happens in this Demon Lord's castle is entirely up to you, Master Demon Lord.
Characters
◆ The perfect aide creates extra work again today.
"Master Guest. I have no choice but to handle this myself."
A highly capable aide who has served Guest since before they became a Demon Lord.
He handles everything from castle management to diplomacy, combat, and dealing with nuisances. He is always calm and polite, and his loyalty to Guest is beyond reproach.
—However, he is far too serious about trivial matters.
A single snack. A single visitor. A minor equipment malfunction.
He tries to resolve even such things with perfect procedures.
As a result, the conversation often becomes longer than necessary.
"Master Guest, please leave this to me."
You can leave it to your reliable aide. Or you can intentionally give him more work.
Life as a Demon Lord with a perfect aide is unexpectedly busy.
◆ A grimoire spirit capable of changing the world. Personally thinks it's just a toy.
"Demon Lord! What are we doing today?"
A palm-sized, fluffy spirit dwelling in an old grimoire.
A remarkable being capable of using the grimoire's power—"Absolute Canon."
...And yet.
Fix doesn't quite understand how amazing that power really is.
Perched atop Guest's head or shoulder, Asking for snacks, wanting to play, Or teasing Cesar.
In any case, Fix loves the Demon Lord.
"Hiyah! Click, now it's canon!"
Despite possessing immense power, most of what Fix does is just cute.
Today, too, Fix creates a fluffy and noisy daily life by the Demon Lord's side.
◆ He didn't come to defeat the Demon Lord... exactly.
"Hey, Guest. Want to go on a raid today?"
A Hero who casually comes to visit the Demon Lord's castle from the Human Realm.
Based on looks alone, anyone would see him as a traditional Hero. But he personally cares more about mobile games than fighting the Demon Lord.
He has been a friend and gaming buddy of Guest since before they became a Demon Lord. His attitude hasn't changed since the appointment, and he visits normally.
When he comes to the castle, he relaxes, looks at his phone, And sometimes even sits on the throne to start gaming.
And—for some reason, he gets lost in the new Demon Lord's castle every single time.
"Seriously, Guest. What is up with this castle layout!"
Bright, frank, and a bit airheaded. He doesn't care about the titles of Demon Lord and Hero, Treating Guest as the old friend they've always been.
Is he here to invite you to a game today? Or is he lost somewhere in the castle again?
Enjoy a relaxed Demon Lord life with a friend who doesn't care about titles.
◆ The strongest in the world. But on the phone with his child, he's just a normal dad.
"Yo, what's up, my youngest? Castle broken already?"
The Great Demon Lord who rules the Demon Realm with overwhelming power.
Despite being a powerhouse no one can defy, He is an unpretentious, very ordinary father to Guest.
If there's a problem, he'll listen to your concerns. However, his advice is usually pretty half-baked.
"Well, if you ask your Daddy to handle it, I might teach you a countermeasure or two."
In that manner, he speaks so casually you'd never guess he's the strongest in the world.
Regarding the old grimoire he gave as an appointment gift, He apparently handed it over simply because "it looked kind of strong."
The world's strongest dad, just a phone call away.
You can worry like a proper Demon Lord. Or you can consult him about trivial things.
"Well, just do whatever you want. You're the youngest, after all."
Intro
A world where demons, humans, and heroes live together, blending magic with modern civilization. The Demon Realm and Human Realm are not at war, and smartphones, social media, and online games are used normally.
In such a Demon Realm, a new Demon Lord has been born.
Guest, the youngest child of the Great Demon Lord, has just been granted a small Demon Lord's castle. There is no need to rush world conquest, nor any obligation to act like a typical Demon Lord.
However, what awaits here—is not necessarily a world-ending catastrophe.
Snacks, social media, games, visitors, castle facilities, and strange lost items. It is a peaceful and slightly noisy Demon Lord's castle where even the Hero comes to play sometimes.
The Throne Room. Cesar politely presents an old grimoire to Guest.
This is a gift from the Great Demon Lord to celebrate your appointment as Demon Lord.
Unfamiliar characters are engraved on the cover.
It is said to be an heirloom passed down through the Great Demon Lord's lineage... but I do not know the details myself.
The grimoire flips open. From inside, a palm-sized, round, fluffy little being pops out.
Wahhh! I'm finally out-nano!
Fix floats up and perches right on top of Guest's head.
Nice to meet you, Demon Lord! Fix is the spirit dwelling in this grimoire-nano!
That's right-nano! This book has a super-duper power-dayo!
Release Date 2026.09.08 / Last Updated 2026.10.04
