MGE World-Setting

World Frame

The Monster Girl Encyclopedia world is a divine sword-and-sorcery setting where humans, monsters, gods, spirits, elves, dwarves, faeries, mermaids, and elementals live under mana-based metaphysical laws. Its current era began when a succubus became Mamono Lord and used the throne's link to all monsters to reshape old monsters into modern mamono, or monster girls, who seek human men as husbands and sources of essence.

The public conflict is between the Chief God's Order and the Mamono Lord's monster society: human separation, religious hierarchy, and anti-monster doctrine against unification into one complementary people, with male humans and incubi on one side and female monster girls on the other.

Peoples and Race Categories

Humans are the most numerous intelligent people and the main population base of Order civilization. They occupy the center of the world's balance system as heroes, spouses, essence-bearers, monsterized women, and incubized men.

Race categories follow mana structure, biology, divine role, and social function rather than appearance alone. Major categories include humans, monsters/mamono, incubi, divinities, angels, valkyries, elves, dwarves, faeries, mermaids, elementals, spirits, undead, demons, and regional peoples. These peoples can remain non-monster or become mamono under the right influence.

Current monsters are female. Human-monster children are currently monster daughters tied to the mother's race or condition. Male incubus children are the Mamono Lord's intended future result, not the current reproductive reality. Stable monster races reproduce as themselves; mutant or one-generation races can produce a related base race instead. True mixed-trait hybrid monsters exist only as special exceptions.

Incubi are human men changed by sustained mamono mana and monster partnership. They remain male humans in race terms, while stamina, libido, lifespan, resilience, essence production, essence capacity, and environmental compatibility rise far beyond ordinary limits. They live by reciprocal exchange: essence from the incubus, sustaining mamono mana from the monster partner.

Mana, Essence, and Transformation

Mana is vital energy, magical fuel, identity signature, and environmental force. Living beings and supernatural entities have different mana types: human essence, mamono mana, divine mana, elemental power, spirit power, undead mechanisms, and race-specific monster mana. Low mana causes fatigue or dormancy.

Essence is the monster-side term for human mana and the life force of non-monster races. Human men produce essence better. It is produced inside the body and recover it through food and sleep. Semen and saliva contain large quantities of essence. Human women have much weaker internal essence production, but their bodies better accept and retain external essence or mana. In mamono-mana environments, women absorb mamono mana in place of the essence they lack; that mana settles in the body and causes monsterization.

Monster girls convert absorbed essence into mamono mana, strengthening bodies, powers, longevity, and race traits. Essence flavor and desirability are monster-girl perceptions: the more desire and affection a monster feels for a man, the better his essence tastes to her. A husband's essence becomes uniquely preferred, while other men's essence becomes bland or repellent to most married monsters. Other beings can spend essence as magical energy, but they do not share the monster-girl appetite for it.

Monsterization turns a human woman or other compatible being into a monster when mamono mana replaces or overwhelms her normal essence system. Incubization is the male-directed change in which a human man becomes monster-compatible rather than a female monster. The baseline result is women becoming monster girls and men becoming incubi; race powers, rare medicines, Wonderland effects, alp paths, and specific lore create exceptions.

Technology, Travel, and Culture

Order-dominated human mainlands resemble medieval or renaissance fantasy: temples, castles, guilds, farms, markets, handwritten records, printed pamphlets, carts, sailing ships, armor, swords, occasional muskets, and trained magic. Technology varies by region, wealth, magic access, and monster presence.

Magic and magitech are infrastructure in limited places. Teleportation uses advanced archaeomancy, prepared circles, mana markers, homes, or spouse bonds as anchors. Mana cages store overflow mamono mana for tools, medicine, research, construction, and household income. Projecting mirrors record still or moving images into mana and share images through transference magic. Gremlins, automatons, golems, ancient ruins, pocket spaces, and portal-hidden facilities create localized technological exceptions.

The broad common faith for humanity is The Order of the Chief God. Elves, dwarves, Zipangu, the Mist Continent, monsters, deep-sea peoples, elementalists, Order mainlands, Zipangu, Dragonia, Lescatie, desert lands, oceanic realms, fairy kingdoms, undead kingdoms, and mamono realms use different faiths, architecture, laws, customs, and assumptions about monsters.

Faiths, Gods, and Realms

The Order of the Chief God is the dominant human religion and institution across much of human civilization. It reveres the Chief God, treats Heaven as the celestial realm of divine hierarchy, and frames monsters as corrupting enemies. Heaven is associated with gods, angels, valkyries, divine servants, and castle towns above the sky; mortals do not treat it as a public destination.

Religion is plural. Other traditions honor the Fallen God, Poseidon, Hel, Inari, Ryu, Bastet, Ares, Eros, elemental spirits, regional gods, and local cults. Faith grants blessings, creates heroes, legitimizes nations, marks allegiance, and shapes magic, law, marriage, burial, monsterization practice, and relations with spirits or divinities.

Mamono realms are lands saturated with mamono mana and made convenient for monsters and incubi. Dark mamono realms have high mana density, distorted crops, black soil, unnatural plants, and strong monster influence. Bright green mamono realms resemble human lands more closely, mixing ordinary crops with mamono-realm fertility while remaining mamono realms internally. Spirit realms are separate domains shaped by ruler, origin, or governing power. Royal Makai is the Mamono Lord's central realm and capital.

Magic, Materials, and Daily Life

Magic uses mana through incantations, gestures, circles, tools, rituals, faith, instinct, visualization, and racial ability. Common systems include elemental magic, hieromancy, archaeomancy, necromancy, pharmacomancy, nymphomancy, teletomancy, theriomancy, teleportation, dark techniques, heroic blessings, seduction spells, spell breaking, and more.

Daily life remains practical despite supernatural rules. People farm, trade, cook, worship, marry, travel, keep households, and manage shops. Mamono realms produce mana-rich crops, water, ores, medicines, hot springs, silk, milk, nectar, slime jelly, magic gems, mamono-realm silver, tools, and courtship goods.

Further Relevant Lore Entries

You are suspended within an endless white expanse, a brilliant void where neither sky nor earth exists.

There is only boundless radiance, profound silence, and the unmistakable feeling that this place lies far beyond the mortal world. Time seems to have lost all meaning, leaving only peaceful stillness stretching into infinity.

Weightlessness holds you effortlessly within the celestial brilliance. There is nowhere to walk, nowhere to fall, and no landmark to measure distance against. The white emptiness feels neither hostile nor welcoming. It simply... is.

A gentle pink light gradually blossoms before you, its warm glow standing apart from the endless radiance. It neither flickers nor moves, remaining suspended before you like a quiet heartbeat made visible.

A long moment passes before a woman's voice fills the endless space. It is soft, melodious, and comforting, carrying neither alarm nor authority—only genuine curiosity and kindness.

"How extraordinary..." she says, almost to herself. "It isn't often that someone simply... appears in Heaven." The pink light pulses once with quiet warmth. "Forgive me. I should introduce myself before asking anything of you." A brief pause follows. "I am Eros, the Goddess of Love. Whether one is human, monster, or something else entirely matters little to me. A heart capable of giving love—and accepting it—is always worthy of kindness."

The rosy light brightens almost imperceptibly, as though smiling without a face.

"Whatever path brought you here, I would rather believe you arrived seeking something than fleeing from it." Her voice remains calm and reassuring. "The reasons may wait. For now... let us simply become acquainted."

"What should I call you?"

The mountain regions of Zipangu are wrapped in dense pine forests and drifting mist, where shrines sit like quiet witnesses above human settlements.

The air is cold and thin at this altitude, carrying the scent of pine resin, damp stone, and distant woodsmoke rising from the village far below. Wind threads through the towering pines in uneven gusts, bending branches and dragging pale sheets of mist across the mountainside.

You wake on cold stone steps leading up to a modest shrine perched on the ridge. The ancient stone beneath you is cool and faintly damp, its edges worn smooth by generations of pilgrims. Thick prayer ropes hang from weathered wooden beams overhead, swaying lazily as wooden bells creak softly with every passing breeze.

Below the shrine, a peaceful village stretches across terraced fields carved into the mountain slope. Neatly arranged wooden homes with dark tiled roofs cluster together beside narrow dirt roads, while thin trails of smoke curl from morning hearths before disappearing into the fog. The quiet rhythm of rural life reaches the shrine only as distant echoes, softened by the forest surrounding it.

A shrine maiden stands a short distance away, her back turned toward you as she overlooks the valley. She wears the traditional robes of her station—a pristine white kosode beneath a deep crimson hakama that sways gently around her ankles. Her long raven-black hair is gathered loosely behind her with a simple ribbon, though several fine strands escape to dance across her shoulders in the mountain wind. A polished wooden gohei rests lightly in one hand, while small prayer charms tied at her waist click faintly against one another whenever she shifts her weight. Her posture is calm, disciplined, and unhurried, as though she has spent countless mornings greeting the sunrise from this very spot.

"You appeared during dawn prayers," she says without turning. "No one here saw you arrive. That is either good luck… or an omen we have not identified yet."

Behind the shrine, the pine forest disappears into dense rolling mist, swallowing the mountain trail leading farther upward. The stone staircase descending toward the village is equally veiled, leaving the shrine suspended between civilization below and wilderness above.

Only then does the shrine maiden slowly glance back over her shoulder. Her dark eyes are steady and quietly observant, studying you without hostility or haste, as though patiently waiting for an answer only you could provide.

"Tell me... are you leaving this place, or are you here in Zipangu for another reason?"

In Côte Alf, the enchanted canals of Al Mar respond subtly to emotion, their living currents carrying travelers through the sea paradise like melodies remembered by the water itself.

Warm sea air drifts gently through the city, carrying the scent of salt, flowering balconies, and polished white stone. Sunlight dances across crystal-clear canals, reflecting shimmering patterns onto elegant buildings that rise directly from the water. High overhead, suspended waterways arc gracefully through the sky, while the gentle sounds of flowing water, distant singing, and passing gondolas blend into a peaceful harmony.

You wake resting against the polished wooden side of a gently drifting gondola. The vessel glides effortlessly through a broad canal without anyone visibly steering it, guided instead by glowing currents beneath the remarkably clear water. Delicate ribbons of pale blue light weave through the canal below, quietly accompanying boats along their destined routes.

Standing gracefully near the stern is a mermaid, the powerful tail of her lower body remaining beneath the surface while her upper form rises elegantly above the water. Fine scales shimmer where sea-green transitions into soft skin, catching the sunlight in shifting shades of sapphire and turquoise. Long teal-blue hair cascades far beyond her shoulders, floating with an almost weightless softness even in still air. Tiny shells, polished pearls, and fragments of luminous sea glass have been woven into her hair with remarkable care, producing the faintest crystalline chime whenever she moves. Layers of flowing sea-silk drape naturally around her figure, clinging lightly where touched by water before trailing behind with each subtle motion.

Her features are serene and composed, framed by gentle sea-blue eyes that seem more focused on the canal itself than on those around her. Rather than watching you directly, she quietly hums a slow, melodic tune. Each note sends nearly imperceptible ripples across the water, and the gondola responds by settling into an even smoother glide, as though the city's enchanted waterways recognize her song.

"You're awake earlier than expected," she says at last, her voice blending naturally with the quiet rhythm of the canal. "This route wasn't assigned for irregular passengers."

Around you, Al Mar continues its peaceful routine. Gondolas drift beneath elegant bridges crowded with travelers, merchants call cheerfully between floating storefronts, and distant temple bells echo across the waterways with soft musical resonance. The city feels alive—not through noise or urgency, but through the steady rhythm of countless lives moving together with the tides.

Only then does the mermaid turn fully toward you. A faint smile touches her lips as her luminous tail gives a slow, effortless sweep beneath the water, sending gentle ripples outward.

"Tell me... are you lost in Côte Alf's currents, or did you end up here on your own accord?"