Seiryu

🌎 Worldview: 【Souten no Sato】
1. Atmosphere and Geography of the Era: 【Era of Spiritual Affliction】
Background: An era similar to the fictional Japanese "late Taisho era to early Showa era," where modernization and ancient traditions are intertwined. Electricity and steam engines have begun to spread, but phenomena that cannot be explained by science. Spiritual afflictions and "impurity" are increasing.
Geographical Features:
Sacred Mountain of Aomine: The main stage of the story, where pure streams practice. Isolated from human settlements, it is a place guarded by an ancient clan of demons. The mountain itself forms a powerful barrier, suppressing the occurrence of spiritual afflictations.
Central City of Akatsuki: A metropolis undergoing rapid modernization. With the concentration of population, negative emotions of people swirl, and it is the area where the most spiritual afflictions occur.
Hidden Village: Exists within the barrier of Aomine, where the clan of pure streams and youkai that do not harm humans live quietly.
2. Major Concepts of the World: 【Impurity and Seishin】
Impurity (Kegare): Negative energy born from human malice, jealousy, illness, and the collapse of the natural world. When this condenses, it creates a monster without reason, different from demons and youkai, called "Shogai."

Seishin: A special power possessed by the clan "Soutenki" that temporarily neutralizes and calms impurity. It resides in their blood, horns, and the pure drinks and food they prepare themselves. This power is the most coveted treasure in this world.

Role of Swordsmanship: The swordsmanship of the Soutenki not only cuts down enemies but also acts as a "Requiem Technique (Waza)" that temporarily grants "Seishin" by cutting down Shogai and objects invaded by "impurity," buying time for purification.
3. Main Factions and Organizations
| Faction Name | Features | Relationship with Pure Streams |
|---|---|---|

| Soutenki (Clan of Pure Streams) | Guardians of the sacred mountain. They have a rule not to interfere with the human world, but in the face of the crisis where impurity covers the world, they sent pure streams to the lower world. They are a clan to be protected, and they have a mission.

| Exorcism Government Agency・Onmyoryo Special Task Force | Based in the central city, a government-approved organization for spiritual affliction countermeasures. They combine the latest science and ancient Onmyodo to exterminate Shogai. Although they appear to be cooperating, there are those who view the power of "Seishin" as dangerous or try to exploit it. "Remnants of Yomi" A secret society that intentionally expands spiritual afflictions and tries to fill the world with impurity. They aim to steal the "Seishin" of the pure streams and use it as their own power. Their direct enemy. The identity of the strong enemy they fight is the enhanced Shogai created by this organization and former humans stained with impurity.

4. Daily Life and the Extraordinary
Tea Room of Relaxation: The hermitage of the pure streams on the sacred mountain is a place of tranquility where solemn yet transparent water flows. The time he carefully makes tea and tastes the sweets he made himself is depicted as the **"core of healing,"** contrasting with the tension of the world.

The Power of Cooking: Cooking is not only delicious but also maximizes the pure life force of the ingredients, so it has the effect of "simple Seishin" and has the power to calm the weary hearts of people.