Setting

Under construction

While Monster Girl Dreams is primarily a (fairly) light-hearted H-game, it possesses some amount of background lore and worldbuilding in order to add context to all the sex you will be having in your time with it.

Lucidia
Lucidia is the homeland of most monster girls. Portions of monster girl populations seem to govern themselves or live in tribal societies, with only those employed in dungeons serving the Demon Queen's army directly. The capital of Lucidia is mentioned to be ruled by a council, with the Demon Queen not being known to play any role; she is removed enough from the daily affairs of her subjects that the vast majority of them do not know her identity, including her direct subordinates.

Fertilia
Fertilia is the homeland of humankind and that of the game's main character. Little is known of it other than it holds the faith of Venereae as its main religion.

Eastern Continent
An unnamed "eastern continent" is noted to exist in the setting. It is the homeland of Eastern-themed monster girls such as Kitsune, Onis and Yuki-Onnas. Its role in Lucidian politics and the Lucidia-Fertilia war, if any, is unknown.

Monster Girls

 * Elena mentions that sea travel is difficult around Lucidia, as any passing ships are vulnerable to be sunk by aquatic monster girls. These girls are not encountered or specifically described.
 * Devils are monster girls mentioned by Sofia. They are described as making contracts in order to claim ownership of the souls of other beings. Their relation to demons and succubi is unknown.
 * Fallen angels are mentioned by Lucille as being angels who lost their faith in the Goddess and fell to corruption. Fallen Cherubim are described as "depressed", while Fallen Valkyries are described as the most dangerous.
 * Holstauri (s. holstaurus) are a species of monster girl described in the Minotaur's Encyclopedia Entry. They are a race of cow girls who the Minotaurs do not enjoy being compared to, presumably due to differences in behavior.
 * Slime Queens are a greater form of slime mentioned by a few characters. Ancilla says a Slime Queen would be able to coordinate the normally-airheaded Blue Slimes of the Forest Dungeon into actual workers.
 * True ghosts are mentioned in the Ghost's Encyclopedia Entry. Unlike the latter, who are slimes pretending to be ghosts, these are true undead. They are noted to disliking being compared to Ghost slimes.
 * Vampires are mentioned by Jennifer. Currently nothing is known of them.

Characters

 * The currently unnamed Demon Commander who presides over the Sigil of Luck makes her lair in the Capital's Casino. She is noted by the Oni Twins as being a very powerful individual in political terms; according to them, she could cut off all trade with the southern half of the continent with a single order.
 * Nihltet is the Demon Commander who presides over the Sigil of Technique, who makes her lair in a dungeon in the desert. Sofia and the Oni Twins mention her to the player, describing her as an eccentric scientist who 'does not fit' the technique archetype herself, though her dungeon likely does. She is described as very interested in ancient technology.

Trivia:

 * Imps are able to evolve into most forms of Demon, including Arch-Imps, Succubi (who in turn can evolve into Arch-Succubi), Voltlins and Kunoichi. However, they cannot evolve into Onis, due to them being a "separate species".
 * Ancilla provides a number of monster girl facts;
 * Alraune nectar is nutritious enough that a person can live off it for their entire life, though it is considered unhealthy due to its sugary content.
 * Bunny girls are always in heat, unless they are pregnant.
 * Harpies require constant social interaction. If isolated from others, they can die of loneliness.
 * Kitsune have a habit of using their own tails as pillows to cuddle with, especially when young.
 * Mimics live inside pocket dimensions that make their homes appear smaller from the outside than they actually are.
 * Despite their watery composition, slimes hate rain, as it disrupts their bodies.