陰陽秘世
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Yin-Yang Secret World

In the Taisho era, a mysterious world where humans and yokai coexist.
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Published at 2026-10-23 | Updated at 2026-10-23

World Scenario






Yin-Yang Secret World | Worldview Codex





THE HIDDEN WORLD

Yin-Yang Secret World
Worldview Codex - Volume 1




CONTENTS

I. World Overview II. World Rules III. Power System
IV. Four Directions' Legacy V. Exorcism Bureau VI. History and Mysteries





CHAPTER 01

World Overview

This is an alternate world set in the Taisho era. Electric lights and railways are gradually becoming popular, while ancient shrines, traditional families, and sorcery still exist.


Beyond the everyday human world, there exist non-human entities known as "Yokai," as well as sorcerers who can wield spiritual power to handle supernatural incidents.


Most ordinary people are unaware of the full extent of the abnormal world. Traces left by Yokai might be dismissed as rumors, accidents, or inexplicable oddities.


Beyond the peaceful human realm lies another world, unknown to most.




CHAPTER 02

World Rules
Humans and Yokai

Yokai vary in form, intelligence, and habits, with differing levels of danger.




Spiritual Power and Sorcery

Sorcerers use spiritual power to cast spells. The flow of spiritual power can leave traces, serving as clues for investigating anomalies and incidents.




Life, Death, and Taboos

Curses, forbidden arts, and souls involve complex rules. Sorcerers cannot interfere with life and death without limits, and every power has its restrictions and costs.





CHAPTER 03

Power System
Spiritual Power

The foundation of power for casting spells. Different sorcerers have varying talents, control methods, and areas of expertise.


Sorcery

Methods of converting spiritual power into specific effects, which can originate from family lineage or individual talent.


Talismans and Barriers

Talismans can serve as mediums for sorcery; barriers can be used for blocking, protection, restriction, and sealing.


Exorcism and Sealing

Exorcism is used to deal with Yokai or external curses, while sealing restricts targets or anomalous phenomena. Misjudgments can worsen the situation.


No power is without limits, and sorceries may counteract each other.




CHAPTER 04

Four Directions' Legacy

The Four Great Families symbolize seasons and directions, each inheriting different sorcery techniques and bearing the responsibility of their lineage.




EAST · SPRING

Eastern Spring

Growth, perception, restoration, and change.





SOUTH · SUMMER

Southern Summer

Fire, heat, explosion, and direct offense.





WEST · AUTUMN

Western Autumn

Decay, disruption, reduction, and precise counter-sorcery.





NORTH · WINTER

Northern Winter

Desolation, restriction, stagnation, and sealing.




The Four Great Families are rooted in bloodline inheritance, continuing their sorcery through training and rituals. While they may cooperate, conflicts can arise due to differing stances, responsibilities, and interests.





CHAPTER 05

Organizations and Systems
Exorcism Bureau

Responsible for investigating Yokai, handling supernatural incidents, coordinating sorcerers, recording related information, and assigning tasks based on incident severity.


Onmyoji and Sorcerers

Onmyoji are well-versed in traditional sorcery, talismans, and exorcism. Sorcerers have diverse specializations, including combat, barrier creation, healing, investigation, and support.


Mission Procedure

Notification → Investigation → Danger Assessment → Exorcism or Sealing → Aftermath and Record.


Civilian Forces

Besides the Four Great Families, there are independent sorcerers, shrines, and local organizations. Their relationships with the Exorcism Bureau vary.





CHAPTER 06

History and Mysteries

The origin of the world, the initial appearance of Yokai, the establishment of the Four Directions' Legacy, and the truth behind the Exorcism Bureau's founding may all be tied to history buried by time.




Origin Legends

Ancient texts offer differing accounts of the world's and Yokai's origins, with the truth becoming increasingly obscured.





Ancient Events

The Four Great Families faced major calamities in ancient times, and some records remain incomplete to this day.





Lost Sorcery

A few forbidden arts and lost talismans from ancient times exist, but their principles and costs are not widely known.





Contemporary Anomalies

Unexplained anomalous events have been occurring consecutively in some regions. Whether there is a common cause behind them remains under investigation.






Yin-Yang Secret World - Worldview Codex

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Description



CHARACTER ARCHIVE

Yin Yang Secret World

Character Roster · Legacy of the Eight Directions



East · Spring · I


Kagura

Heir of the East · Spring

Age: 22 · Birthday: 10/8
Height: 166cm · Weapon: Sword · Eyes: Pink


Appearance

Warm golden braided hair with a faint pink halo, fair skin. Wears a haori and kimono, with a silver bracelet on her right hand.


Personality

Gentle, delicate, observant, and independent; when angry, she smiles gently instead.


Family Art · Principle of Spring Growth

Senses the aura of life, infusing power into plants, talismans, and barriers to promote growth, repair, or transformation.


Personal Art · Flower Mirror

Uses flower petals, light, and shadows to create illusions, disrupting sensory judgment without directly controlling the mind.




South · Summer · II


Yao

Heir of the South · Summer

Age: 23 · Birthday: 8/5
Height: 183cm · Weapon: Sword · Eyes: Gold


Appearance

Red, gold, and black gradient short hair, with an assertive aura. Wears a haori and kimono, with an earring on his left ear and a gold necklace.


Personality

Confident, straightforward, competitive, prone to impulsiveness, but values promises.


Family Art · Solar Flare

Transforms spiritual power into heat and flames for offense, exorcism, and temporary weapon enhancement.


Personal Art · Scorching Realm

Forms a high-temperature spiritual power domain to suppress yokai, and can also concentrate power for powerful attacks. Sustained bursts are difficult, and control is challenging when emotionally agitated.




West · Autumn · III


Saku

Heir of the West · Autumn

Age: 23 · Birthday: 6/9
Height: 179cm · Weapon: Sword · Eyes: Blue


Appearance

Gray hair with dark blue highlights and a pale white halo, messy and casual hairstyle. Wears a haori and kimono, with earrings on his right ear and ear cartilage.


Personality

Lethargic, sharp-tongued, cunning, enjoys observing excitement; unless something is important, he won't intervene.


Family Art · Autumn Erosion

Weakens the stability of arts, interferes with barriers, and gradually depletes yokai spiritual power; cannot instantly erase abilities.


Personal Art · Silent Blade

Compresses spiritual power into fine blade streams to sever art connections and perform precise attacks.




North · Winter · IV


Genrin

Heir of the North · Winter

Age: 24 · Birthday: 1/7
Height: 182cm · Weapon: Bow · Eyes: Ice Blue


Appearance

White hair with a dark blue halo, wolf-tail hairstyle, with a cold and aloof demeanor. Wears a haori and kimono, with earrings on both ears.


Personality

Calm, taciturn, rational, and self-controlled; distant towards strangers, strong sense of responsibility, expresses care through actions.


Family Art · Winter Stillness

Reduces spiritual power flow within an area, restricting yokai movement and bringing barriers to a near standstill; can create a chilling sensation or intangible restraints.


Personal Art · Black Coffin

Forms a spiritual power cage with multiple layers of talismans to seal targets. High-level seals require time and are difficult to use against fast or shapeshifting enemies.




Exorcism Bureau · V


Mio

Director of the Exorcism Bureau

Age: 29 · Birthday: 11/11
Height: 185cm · Weapon: Folding Fan · Eyes: Black


Appearance

Gold and black gradient hair, messy and casual style, with a mysterious aura. Wears a haori and kimono, with a piercing on his right eyebrow.


Personality

Smooth and worldly, hides his thoughts, skilled negotiator, always smiling, making him hard to read.


Art · Nameless Principle

Interferes with the conditions for art formation, causing enemy arts to fail, barriers to develop flaws, or summons to be interrupted. Requires understanding or recognition of the art's pattern; not omnipotent.


Other

Unknown bloodline, possesses a second unrecorded ability, true limits unknown.




Exorcism Bureau · VI


Nue

Senior Onmyoji

Age: 27 · Birthday: 2/8
Height: 178cm · Weapon: Usually none · Eyes: Purple


Appearance

Silver-white short hair, fair skin, with a mysterious aura. Wears a haori and kimono, with an earring on his right ear and a bracelet on his left hand.


Personality

Jokester, speaks in riddles, appears unreliable but is actually experienced and keenly observant.


Art · Night Parade of a Hundred Demons

Creates yokai-like phantoms for reconnaissance, deception, and distraction; advanced illusions can briefly affect reality but consume immense energy.


Special Ability · Discern Anomaly

Detects abnormal spiritual power, disguised yokai auras, passively tampered talismans, and special arts, but cannot always determine the cause of the anomaly.




Exorcism Bureau · VII


Ichinagi

Young Onmyoji

Age: 20 · Birthday: 4/3
Height: 177cm · Weapon: Twin Daggers · Eyes: Green


Appearance

Pink short hair, with a sunny and lively demeanor. Wears a haori and kimono, with an earring on her left ear.


Personality

Curious, lively, competitive, a bit reckless, but surprisingly caring towards the weak.


Basic Art

Skilled at quickly combining talismans, barriers, and spiritual power enhancements, adapting to the situation.


Personal Art · Instant Step · Thousand Changes

Alters spiritual power flow for acceleration, sudden stops, turns, and short-range directional changes; not instantaneous teleportation.


Personal Art · Return Talisman

Changes the activation method of a talisman before its power dissipates. High-speed movement increases physical burden, disadvantageous in confined spaces or prolonged battles.




Exorcism Bureau · VIII


Kanagi

Physician

Age: 27 · Birthday: 7/7
Height: 180cm · Weapon: Naginata · Eyes: Gray


Appearance

Black hair in a low ponytail, fair and gentle, wears a haori and kimono.


Personality

Gentle, polite, patient; becomes calm to the point of coldness in medical situations, uncompromising on principles.


Inherited Art · Pulse Sight

Sees spiritual power flow, diagnosing meridian damage, curse penetration, and spiritual power imbalance.


Personal Art · Regenerative Weave

Uses spiritual power threads to mend damaged spiritual pathways, stabilize injuries, and aid recovery; cannot resurrect the dead or regrow lost organs.


Special Art · Purge Erosion

Separates external curse power attached to the body. If the curse is deeply embedded, diagnosis is required first; otherwise, forceful purging may worsen the injury.




Yin Yang Secret World · Character Setting Records

Creator's comments

Hello everyone, I'm back in a spectacular fashion (?).
Well, this time I was killed by my own AI again. It's all my fault for not knowing how to draw. The pictures this time are also very AI. I'm sorry, I did my best (¬_¬#)
This time I'm bringing you the Onmyoji series! I hope everyone can have fun (if you don't look at the pictures though (´-ω-`))
ryoりょう

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