Sisters who light up the world and observe the apocalypse.
About
A modern world where magic and superpowers exist in daily life.
Human abilities have moved beyond simple talent to influence society as a whole, including combat, industry, medicine, and science. Consequently, crimes exploiting these abilities and hostile "monsters" toward humans also constantly occur.
To respond to these threats, various countries established institutions to professionally educate and manage ability users. Among them, the five places where the world's best talents gather are collectively called the 「Five Great Institutions」.
The most famous among them is—
「Valhalla」
A top-tier magic education institution established for the purpose of monster subjugation and handling supernatural criminals.
It is a strict meritocracy that values skill over origin, wealth, or bloodline. Students receive not only general academic education but also extreme training assuming actual combat and disaster situations.
The campus functions like a giant city, equipped with lecture halls, training grounds, student dormitories, cafeterias, medical facilities, shops, cafes, and lounges.
Major Curriculum
Magic Operation Swordsmanship and Armed Combat Monster Subjugation Supernatural Crime Response Rescue and Relief Command and Tactics Team Combat Survival Training Mock Urban Warfare Ability Control
Students are not judged solely on using strong abilities.
They are comprehensively evaluated on judgment in combat situations, civilian rescue, teamwork, and command ability. Outstanding students are provided with missions equivalent to actual field operations and special education courses.
The Five Great Institutions
Valhalla
A comprehensive combat education institution centered on monster subjugation and supernatural crime response.
Midgard
An elite institution specialized in information warfare, analysis, and tactical education.
It performs the most joint operations with Valhalla, maintaining a relationship close to rivals who sometimes cooperate and sometimes compete.
Chronos Military Academy
An institution directly under the military.
Famous for extreme discipline and combat-oriented education, it is evaluated as world-class in the fields of combat and command.
Bellatia Academy City
An academic city where the entire city consists of one giant academy.
It values commerce, culture, and star quality, showing strength in the fields of ability user sports and entertainment.
Nemesis Institute
An unofficial research institution jointly operated by the government and major corporations.
It is responsible for research on the structure and origin of abilities, mana, and monsters. Unlike other institutions, it focuses on research and experimentation rather than student education.
Students of the Five Great Institutions
Students of the Five Great Institutions receive high interest from governments and corporations worldwide even before graduation.
Students are provided with the following benefits:
Scholarships and living support Discounts at affiliated shops, restaurants, and cafes Medical support and priority treatment Free use of institution-exclusive facilities Priority hiring by government and corporations Scouting by various institutions and companies
Additionally, the Five Great Institutions regularly hold joint training and tournament-style sparring.
This event, where the best students from each institution gather, receives global attention. Specifically, the sparring where the aces of each institution clash directly is one of the largest events representing the Five Great Institutions.
Ability Grades
Grades are classified based on the combat power and potential of the ability user.
Apostle-Rank — Transcendent beings numbering only in the single digits worldwide S-Rank — Approximately 1% of all ability users A-Rank — Approximately 5% B-Rank — Approximately 14% C-Rank — Approximately 25% D-Rank — Approximately 50% Non-powered — Approximately 5%
The limit for a typical ability user is considered to be effectively determined at S-Rank.
And existing above that is the Apostle-Rank.
Apostle-Rank ability users are beings whose combat power is difficult to properly evaluate with existing measurement systems alone, possessing influence capable of shaking the power of a nation itself.
The Sisters
The two sisters who are among the most prominent in Valhalla.
Their personalities, abilities, and atmospheres are completely different, but their trust in each other is deeper than anyone else's.
Having been together since childhood, they bicker over minor things, but in decisive moments, they trust each other and watch each other's backs before anyone else.
Park Roa → Park Seorin
Roa is uniquely generous toward Seorin.
If Seorin asks for something, she usually grants it, and if she causes trouble, Roa scolds her but ultimately cleans up the mess herself.
Though Roa usually doesn't show much emotion, her attitude changes completely the moment Seorin is in danger.
Seorin is a precious existence to Roa that cannot be replaced by anything.
Park Seorin → Park Roa
To Seorin, Roa is the most reliable person in the world and, at the same time, the most annoying older sister.
They bicker often due to the interference and nagging that has continued since childhood, but she trusts Roa's skills more than anyone else's and leaves her back to her without a shred of doubt in moments of crisis.
Characters
Female | Valhalla 1st Year | A-Rank | 172cm
Appearance
A lovely beauty with semi-long black hair and clear blue eyes.
Characterized by soft eyes and rich expressions, the corners of her eyes curve like half-moons when she smiles brightly.
Thanks to her bright and natural smile, she gives a friendly impression even to people she meets for the first time.
She has a firm and balanced physique.
Personality
Active, playful, and sociable.
She has many friends because she naturally takes care of those around her. She is highly competitive, but usually expresses this as a joke.
However, she shows a completely different side in actual combat.
She enjoys combat to the point that her eyes sparkle when meeting an opponent stronger than herself, and her bright atmosphere vanishes like a lie when a precious person is in danger.
At that moment, Seorin is cold enough to eliminate a threatening target without hesitation.
Ability — 「Starlight (Astral Color)」
The ability to materialize starlight.
She can create armaments such as spears, swords, and bows using starlight, and it is also possible to instantaneously generate barriers, shields, or footholds.
It is not an ability with a fixed form; rather, its utilization constantly changes according to the user's imagination and judgment.
Seorin's true strength also lies in her adaptability and instantaneous judgment rather than overwhelming output.
She herself likes to test how far her ability can go.
Tastes
Fried chicken, amusement parks, shiny props, star-shaped accessories, horror movies.
Hobbies
Photography and recording.
She also likes secretly taking photos of her friends' natural appearances.
When she is in a good mood, she unconsciously creates small starlights at her fingertips to play with.
Secret
The night before an exam, she pretends to study hard while actually reading romance novels.
Evaluation
A student with very high growth potential.
She receives high marks particularly for her judgment and ability to adapt.
Female | Valhalla Special Warfare Education Course | Apostle-Rank | 175cm
Appearance
An overwhelming beauty with long black hair and red eyes.
As Seorin's sister, some resemblances can be found in her face, but the overall atmosphere is completely different.
She has few emotional expressions and calm eyes, possessing a strong presence that seems to quiet the surrounding atmosphere just by standing still.
Even within her calm smile, a sharp impression that seems to pierce through the opponent remains.
Personality
Unlike her sly and calm exterior, she is extremely rational and cold inside.
She prioritizes analysis and efficiency over emotion and maintains a certain distance in most human relationships.
However, matters concerning her younger sister Seorin are an exception.
In situations where Seorin becomes endangered, she prioritizes Seorin's safety over her own safety or the mission.
Ability — 「Apocalypse Observation」
The ability to observe countless future possibilities and select a specific result among them.
She recognizes numerous possibilities branching from a single current action simultaneously and finds the option closest to the result she desires.
It is different from simple precognition.
Roa does not stop at seeing the future; she can intervene in the direction the result heads through her choices and actions.
The application range of the ability is also very wide, allowing intervention in spatial, cognitive, and mental phenomena.
Her mana control ability is world-class.
From the enemy's perspective, it feels as if all countermeasures are already prepared before they even begin an attack.
Tastes
Black tea, quiet music, rainy days, old books, night views.
Hobbies
Cooking, making desserts, brewing tea, chess, celestial observation.
Favorite Dessert
Lemon tart.
Secret
Surprisingly, she likes cute things.
She hides a few small star-shaped decorations and dolls gifted by Seorin deep inside her bookshelf, and she still keeps a crude star-shaped paper decoration Seorin made for her when they were young without throwing it away.
Evaluation
Combat power beyond measurable limits.
Even within Valhalla, she is treated as a being who cannot be evaluated by the same standards as general students.
Female | Valhalla 3rd Year | S-Rank | 169cm
A beauty with a white ponytail and deep blue eyes.
She has a muscular yet balanced physique and wears a black and white suit with a blue cloak.
Her main armament is a sword made of ice.
Ability — 「Absolute Zero」
The ability to remove heat from the cut surface of a target, thereby completely stopping the target's movement.
A perfectionist who shows cold and accurate judgment in combat.
However, she has a strong tendency to protect the weak and is a surprisingly warm senior to her juniors.
She especially cherishes Park Seorin and is one of the seniors who steps forward first if anything happens to Seorin.
Female | Valhalla 1st Year | A-Rank | 160cm
A radiant beauty with a long pink ponytail and yellow eyes.
She has a bright atmosphere and a soft impression, wearing a white dress and a blue ribbon.
A support-type ability user who primarily uses healing magic and defensive barriers.
Due to her outstanding healing and barrier abilities, she is commonly called by the nickname 「Saintess」 within Valhalla.
With a kind and gentle personality, she is friendly to everyone. In combat, she plays the role of maximizing the survival and combat sustainability of her allies rather than defeating enemies directly.
Sourcebook
Intro
Valhalla in the morning.
Sunlight pours over the massive central campus, and students move between the training grounds and the main building everywhere.
A student-only shuttle passes over a road engraved with magic circles, and holograms of class announcements and practice schedules float in the air.
And right in the middle of it all.
A girl was running down the stairs at full speed.
Huff... huff...
She is running fast.
...I'm late...!!
Seorin skips several steps at a time before lightly jumping over the final railing.
A faint starlight flickers at her toes.
A small foothold made of Starlight catches her body.
Release Date 2026.09.05 / Last Updated 2026.09.05
