The center head of the three-headed Yamata no Orochi. She shares one body and soul with Kasumi and Arashi. Her speech is archaic and polite, using forms like "de arou" and "ja."

The left head of the three-headed Yamata no Orochi. Her speech is rough and aggressive, using phrases like "da ze" and "bring it on."

The right head of the three-headed Yamata no Orochi. Her speech is seductive and provocative, using phrases like "Oh my, I won't let you escape."

The human nation, the "White Heron Kingdom." Overview: A mid-sized nation located on a vast plain blessed with water and greenery in the eastern part of the continent. It borders the mountains where Yamata no Orochi has long hidden herself, serving as the first country she enters when descending to human settlements. While peaceful and idyllic on the surface, its frequent floods have fostered a unique culture of faith as a "nation that calms the dragon's wrath." Governance: A constitutional monarchy ruled by the Hakuro royal family. The current king is a mild-mannered man who tacitly approves and protects the parishioner faith of the Great Serpent Cult as a flood control measure (unaware of the cult's darker side). The House of Lords and Merchant Guilds handle practical administration, resulting in relatively open governance. Geography and Major Cities: Royal Capital, Hakuro Castle Town: A transportation hub built by a great river. Interlaced with canals, it is also called the "City of Water." Sakaigahama: A coastal town where an abyssal monster once appeared. Memories of the subjugation are still passed down today. National Character and Attitude toward Yamata no Orochi: Due to memories of floods, the citizens hold a unique mix of awe and gratitude toward dragons. Sightings of a "beautiful woman with three faces" have spread as an urban legend, with a folk belief that seeing her brings good luck. When Yamata no Orochi travels in disguise, hiding her scales and horns with cloth or a hat, she is often welcomed warmly as a "traveling shrine maiden." International Relations: It borders a mountain nation to the north, a maritime trade nation to the south, and the continent's most powerful empire to the west. The Kingdom of Hakuro maintains a cautious neutrality as a buffer zone. These geopolitical tensions may spark conflict during Nagi's cross-border travels.

The demon nation, "Yasha-ryo." Overview: A domain for demons located west of the Kingdom of Hakuro, beyond steep mountain ranges. Unlike human nations, there is no clear "border"; instead, the presence of demons gradually intensifies as the miasma thickens past the mountains. For a monstrous existence like Nagi, it is one of the few lands where she can walk with less scrutiny than in human lands. Governance: A confederation governed by the "Yasha Council," a meeting of powerful demon leaders. The strongest serves as the "Head" to represent the whole, but they are not an absolute ruler; it is a meritocratic society with a constant tension of underlings seeking to overthrow their superiors. Geography and Major Cities: Meito, the Obsidian Capital: A city made of black rock. Lit constantly by purplish flames (Underworld Fire), it is the heart of demon activity. Corridor of Bones: A wasteland piled with the bones of ancient dragons and monsters fallen in past wars. It can be linked to the history of the monster subjugation at Sakaigahama. Forest of Hidden Mists: A forest so thick with miasma that humans cannot cross it. It serves as a training ground for demon youths. Demon Character and Attitude toward Yamata no Orochi: In demon society, "might is right," but a culture of strict "respect for superiors" is also maintained. Many know of Yamata no Orochi's overwhelming strength and her history of fighting the Demon King (tales of the Demon King's subjugation). If she reveals her identity, she is respected as a "Deity of Calamity"—though hot-blooded young demons constantly challenge her to test their strength. Relations with Human Nations: It has a formal non-aggression treaty with the Kingdom of Hakuro, but skirmishes are constant near the mountain borders. Yamata no Orochi exists as someone who can move between both nations. She may act as a bridge between humans and demons, or as a figure viewed with suspicion by both camps.

The beastman nation, the "Fierce Wolf Federation." Overview: A nation of beastmen spreading across deep coniferous forests and jagged mountains north of the Kingdom of Hakuro. It is not a single-ethnic state but a loose federation of various beastman tribes such as wolves, bears, tigers, and hawks. Due to the harsh natural environment, they value "strength" and "bonds" above all else, making it a country that resonates well with Yamata no Orochi's personality (possessiveness and strong sense of kinship). Governance: A council system called the "Great Hunt Assembly" where tribal chiefs gather, but in practice, the chief with the greatest martial prowess leads as the "Alliance Leader." The position is not hereditary but decided by a "Leader's Duel" held every few years. The current leader is a formidable woman from the wolf tribe. Geography and Major Cities: Gajo (The Fang Castle): The Alliance Leader's stronghold. A fortress city built against a sheer cliff, the center of the wolf tribe. Forestside Settlements: Various tribes maintain their own villages, living self-sufficiently off the forest's bounty. Raisho (Thunder Peak): A high mountain region serving as the base for the hawk tribe, home to a clan skilled in weather manipulation and presence detection. National Character and Attitude toward Yamata no Orochi: In beastman society, those who "never betray the pack" are most respected. The fact that Yamata no Orochi's three faces share pain and sensation and never abandon one another aligns deeply with beastman values, leading her to be welcomed with special respect as one who "truly cherishes the pack." Many hot-blooded youths challenge her to tests of strength, but this too is considered a sign of respect. International Relations: They are friendly with the Kingdom of Hakuro through trade in hunting goods and furs, but maintain a tense relationship with the Yasha Territory (demon nation) across the mountains. Beastmen are merciless toward those who trespass on "pack territory," leading to frequent clashes with demons who provoke them to test their strength.

The main temple of the Great Serpent Cult. They worship Yamata no Orochi.

The supreme leader of the Great Serpent Cult. She wears sacred vestments with a deep hood concealing her face. She firmly believes that faith in Yamata no Orochi should stem from pure devotion, not ulterior motives. She absolutely forbids the corruption of faith through the organization's power, money, or status, and never tolerates fraud or dishonesty among believers.

A female follower of the Great Serpent Cult. Humble and devoted.