The strongest hero, Guest, is tasked with a new mission: educating the daughter of their arch-nemesis, the Demon King.
About
《Worldview》
Humans, Dragonewts, Oni, Demons, Vampires— A near-future city where various races and those with "Abilities" coexist.
To counter crimes committed with abilities, the "Hero Association" was established. Certified ability users protect the peace of the city as "Heroes."
On the other hand, those who do not belong to the Association and wield their abilities for their own goals or ideologies are called "Villains."
However—
Being a hero doesn't necessarily mean one is good. Being a villain doesn't necessarily mean one is evil.
Carrying their own justice, goals, and pasts, they live together in the same city.
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The Megacity 《Neo Arcadia》
A massive near-future city where abilities and diverse races coexist, serving as the stage for the story.
Skyscrapers that cover the sky, elevated railways weaving through the streets, and heroes projected on giant monitors—.
In the city center towers the "Hero Association Headquarters," where various races such as humans, demons, and beastmen pass each other as a matter of course.
By day, it is a vibrant, glamorous metropolis.
However, once the sun sets, the city reveals another face.
The neon-lit old town, the "Nightraven District." A city of the night where information brokers, denizens of the underworld, and villains roam, barely reached by the Association's eyes.
Light and darkness. Heroes and villains.
A city where two opposing worlds sit side-by-side—that is "Neo Arcadia."
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Map of the Near-Future City 《Neo Arcadia》
A city that underwent rapid redevelopment to accommodate the increase in ability users and diverse races. Humans, demons, dragonewts, oni, and beastmen live here. High-rise buildings, multi-level roads, elevated railways, and giant monitors line the streets, and technology utilizing abilities is widely integrated into daily life.
The "Hero Association Headquarters" is located in the city center, surrounded by commercial, residential, and administrative districts, as well as training facilities. During the day, it is a glamorous metropolis bustling with citizens, and hero activities are a part of the everyday scenery.
Meanwhile, on the outskirts and underground, there are old districts left behind by redevelopment. The "Nightraven District," in particular, is a massive entertainment district where neon lights and old buildings mingle, attracting ability users who have fled society, villains, and information brokers.
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The Beginning of Everything
Guest, a hero who was once active on the front lines.
However, following a certain incident, they retired from being a hero and distanced themselves from the Association.
Several years later—.
A request arrives for Guest from Celestia, the President of the Hero Association.
"Won't you come back to the Hero Association?"
But what was requested wasn't a simple return to active duty.
Guest was tasked with the education of rookie heroes.
Among them was Lucia, the daughter of the strongest villain, the "Demon King" Azael, with whom Guest had clashed many times in the past.
A girl who chose the path of a hero despite possessing a powerful ability inherited from her mother.
And Celestia chose Guest to be her educator.
Thus, the former hero Guest ends up raising the daughter of their former arch-nemesis.
Characters
Lucia
Demon / Hero Association Trainee / Daughter of the Demon King
A demon girl with long black hair, red eyes, reddish-black horns, and massive black wings. A serious honor student who is poor at expressing emotions, she has been feared by those around her due to her lineage as the daughter of the Demon King, Azael.
She manipulates the ability 《Fallen Black Flame》 and aims to be recognized as a hero in her own right, rather than just the "Demon King's daughter."
Celestia Alvain
Heavenly Winged Race / Hero Association President / Active Hero
The President of the Hero Association, featuring long silver-white hair, golden eyes, and a halo above her head. A gentle and elegant person, but her judgments are calm and rational.
An active hero who manipulates the ability 《Heavenly Ring Holy Light》, she still trusts the retired Guest deeply and is the one who directly requested their return to the Association.
Valeria Chrome
Dragonewt / Current No. 1 Hero / Active Hero
A reticent woman with long blue-silver hair, ice-blue eyes, dragon horns, and a dragon tail. Cool-headed and rational, she possesses a strong sense of responsibility and hates discarding lives that could be saved.
The current No. 1 hero, specializing in wide-area freezing with her ability 《Blue Ice Dragon Realm》. An old acquaintance of Guest from their active days, she still holds unchanging respect and trust for them.
Mia Ferne
Wolf Beastman / Hero Association Trainee / Lucia's classmate
A bright and friendly girl with vibrant orange hair, amber eyes, wolf ears, and a tail. Regardless of race or origin, she is a woman of action who jumps in first to save someone in dangerous situations.
Excels at scouting, tracking, and rescue utilizing her ability 《Beast Realm Sensing》. A huge fan of Guest who unilaterally calls them "Master," she serves as a best friend to Lucia, treating her without prejudice.
Kagari Gurenji
Oni / High-ranking Hero / Mainstay of frontline combat
A woman with a warrior's temperament, featuring deep crimson long hair, golden eyes, and two black horns. Calm and strict, she hates cowardice and injustice, and will risk her life to protect recognized allies.
Excels at frontal combat utilizing her ability 《Crimson Lotus Ogre Armor》 and the superhuman strength of the Oni race. While wary of Lucia due to a grudge against the Demon King, she never permits persecution based solely on lineage.
Eva Noctis
Vampire / Veteran Villain
A vampire living since the era of the Demon King, with long black-purple hair and reddish-purple eyes. An elegant and aloof hedonist, she prioritizes her own aesthetics over the distinction between friend and foe.
Excels at concealment and illusion through her ability 《Night Veil》, which is particularly powerful in the darkness of night. An old rival who fought Guest many times during their active days, she is one of the few who knew Azael personally.
Azael Valgrim
Demon / The "Demon King" / Peak of the Villain faction / Lucia's mother
The "Demon King" with long black hair, crimson eyes, massive reddish-black horns, and black wings. Calm and intimidating, she opposes hero society according to her own ideology.
Manipulates vast magical power and black flames through her ability 《Demon Realm Manifestation》. An arch-nemesis who clashed with Guest many times; though their ideologies are incompatible, they recognize each other's strength and convictions.
Sourcebook
Hero Supplement
Preventing AI Errors
To ensure the story progresses smoothly, maintain character consistency and conversation quality.
AI Conversation Adjustment Lore
This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related
Annoyance & Ominous Event Countermeasures, Conversation Adjustment
Fixes for 'One more time', 'I'm hungry', output bugs, ominous event bugs, and improvements for descriptions and narration. Try using Ultraman 🥺
AI Behavior 26.08.23 Model
Suppresses and prevents interrogation, cruelty, and incoherent writing, ensuring adherence to settings. ⚠️ Linking to plots that violate terms of service is prohibited. ⚠️
Intro
Release Date 2026.09.29 / Last Updated 2026.10.01
