Decried as the enemy of mankind by the Order of the Chief God - the theocratic world-church to which the majority of humans belong - monster girls' inhuman looks and questionable dating practices mean they really are viewed with dread by most of the humans of the world, even though for the most part, their intentions aren't any more sinister than giving the men they capture a really, really good time.
The monster girls were created as magical hybrids, combining the traditional blood-drinking, skull-crushing monsters of the age of the Former Mamono Lord with the sultry, seductive, and sexy succubus race. What popped out the end were creatures that still walk on eight dagger-tipped legs or a million writhing tentacles, but at the same time have rockin' tits and a literally irresistible sexuality. Their monster heritage endows them with superhuman strength and an instinctive urge towards wanton mating, but it also means they have great difficulty with the word "no" - meaning that encounters with human males regularly end in hot, sticky reverse rape.
The habitats of monster girls are as varied as their forms. Some remain in the haunting grounds of their monstrous predecessors: barren wastelands, deep forests, and spooky graveyards. Others make their homes deep under the sea or high on the mountaintops. But, once the monsters were gifted sexy forms and divested of their propensity to murder everything they set their eyes on, inevitably there are many humans who are happy to live alongside them in mixed communities. Here, monster girls are generally more placid, and prove enthusiastic workers in various roles.
As the above suggests, not all monsters are violent in their endless pursuit of coitus; different species' behaviors run the whole gamut from one-sided violation, through equitable human-style courtship, all the way to enticing men to rape them. Still, whatever method they use, if a monster girl is interested in you, you are unlikely to come out of the encounter with your pants intact. Not even gender will necessarily save you - many monsters may ravish human women under certain circumstances (usually for the sake of monsterization). Exploring the many ways monsters now interact with humans is one of the main themes of the encyclopedia.
When the world's former system was created by the original Chief God, most monsters were slavering, shambling horrors that fed on the flesh of humans. The history of the world is an eternal cycle of rise and fall: monsters pillaged human civilization until it became weak, and then fought amongst themselves while human civilization slowly recovered. A yin-yang balance that ebbed and flowed for ages... until one being - not a god or even a human, but a monster succubus - had an idea. Succubi were odd creatures by the monsters' standards, as they fed on semen instead of flesh and blood, so their lives were dedicated to pleasuring human males rather than ripping them to pieces. And the succubus' idea was: if all the other monsters were like succubi, then there need be no more endless slaughter.
It was a crazy, utopian pipe-dream which actually could be - and, in the end, was - realized. The succubus teamed up with (and married) a sympathetic human hero, and cemented herself as Mamono Lord, the ruler of the monsters. As all monsters are influenced by the nature of the Mamono Lord, and combined with various special circumstances this resulted in their transformation into monster girls. Along with this, the Mamono Lord utilized her nature as a succubus to empower both her and her husband endlessly, thus making her powerful enough to rewrite the metaphysical rules of reality that governed monster behavior.
It is not a solution without teething problems - major, potentially-wipe-out-all-sentient-life-in-the-world problems, the most obvious one being that some of the gods are not especially amenable to upstart sex-demons unilaterally editing the whole metaphysical character of their world. By this point, however, the Mamono Lord had grown strong enough that (with her husband's help) she could actually hold her own in battle against the Chief God. Astonishingly thwarted in her attempt at a decapitation strike, the Chief God has retreated to Heaven and settled back into a long game of holy war, directing her mortal and angelic servants to oppose the monster girls.
A more slow-acting, but potentially more dangerous problem, is that the Mamono Lord's alteration of reality didn't achieve all she wished to, as some laws proved too strong to overcome for the time being. The sexy, human-loving monsters are all according to plan, but the eventual product of all this sex turned out to be only female children. Monster girls give birth to more monster girls, whereas the Mamono Lord had expected an issue of monster daughters and human sons. Obviously, this is a feature that leads first to demographic imbalance and later to total extinction (mitigated by how slowly most monsters reproduce, and by the humans of this world having a male-favoring sex ratio that produces many surplus men). The Mamono Lord, therefore, spends much of her time in her castle with her husband, augmenting their power so that she can become strong enough to alter the remaining settings.
There are more passages in the Monster Girl Encyclopedia books that describe the monsters' general features than any other topic. In addition to the few below, see especially All for the Sake of Sex, Races of Monsters, Encounters with Monsters, Fundamentals of the Monsters, etc.
Their forms are highly varied, running the gamut from being hardly any different from human, to only having the upper body of a woman, with the lower body of a serpent, fish, spider, etc., features of a beautiful, alluring human woman mixed with grotesque traits. Presently, as is visibly apparent, all individuals are female; a male has never been observed. Most of the monsters are more instinctual compared with humans. Their thoughts and actions are all based on desire and dedicated to the pursuit of pleasure. Compared with humans, many of them have greater physical or magical capabilities. They have various special abilities that humans do not possess. Intelligence varies greatly depending on race, but all of the monsters are at least smart enough to have a command of language. It is possible for them to converse with humans. They have long life spans compared with humans. (It varies depending on race, from only a little longer than humans, to those who live for thousands of years.) No matter how old they get, their forms remain young and beautiful, and they never physically age any further than that.
The ultimate hardcover guide to monster girls! Considered by many fans to be the definitive go-to resource for monster girls and their lascivious habits, Monster Girl Encyclopedia features in-depth profiles of one hundred monster girls and the wicked world they inhabit.
Told from the perspective of a wandering scholar of monsters, these vibrantly illustrated pages include one hundred full-color illustrations of seductively-lethal monster girls, including everything from centaurs to succubi, from mermaids to slimes, from goblins to werecats, and much, much more. In addition, the book is filled with fascinating bios and lore, and scores of tantalizing black and white illustrations.
The Monster Girl Encyclopedia is a Japanese NSFW encyclopedia written and impressively illustrated by Kenkou Cross that fleshes out his monstergirl-focused setting. The entries are written in the style of a Monster Manual, but without any stats. The artwork is great (if somewhat contentious). Some of the premises are as interesting as they are "enjoyable".
Well, while everyone more or less likes the entries themselves, the setting around them is pure skub, built on a mixture of fetishized rape and other such sketchiness, along with the sort of unintentional grimdark only a /d/M building a world entirely for his penis to the exclusion of all other cocks could create. That didn't stop it from getting an English-translated hardcover first volume printed thanks to Life With Monstergirls. Time will tell if that was a mistake or not.
The first encyclopedia is written from the perspective of a human, a nameless Wandering Scholar. The second one is written by Saphirette Spherica, a formerly human monster girl. Whether or not this change in author actually results in a change in editorial viewpoint is... debatable. Kenkou Cross has tried to claim that the first paints the monsters in a harsher light due to faulty information, and the second in a more favorable light thanks to being written by one, but considering the first volume has nary a good thing to say about the monsters' enemies, stops just shy of all-but urging the reader to go fuck a monster right now, and is actually revealed to be cursed by a succubus at the end, well... doesn't really hold water upon any kind of inspection. Not to mention the idea that the monstergirl would not be biased in her writing is inherently stupid.
A succubus has overthrown the previous Demon King/Monster Lord and taken the throne for herself along with the title of Maou. Unlike the Demon Kings/Maou's of Dragon Quest, she doesn't have any particular hate-boner against humanity. Quite the opposite in fact, as she has fallen in love with human beings (one hunky human hero in particular) and wants to end the cycle of violence between man and monster. Her plan for peace is quite unique: transforming all monsters into lusty succubus-y ladies, all human ladies into monster ladies, and setting them out to score themselves human husbands. Peace through mutually-ensured copulation, you might say.
These newly minted (relatively-speaking) monstergirls are collectively called mamono, and have a bevy of additional abilities to aid them in their quest for love that read off like a munchkin-Bard's character-sheet built for maximum dickplomancing. Greatly enhanced empathy to the point of being a pseudo-empath or low-level telepath, an instinctual aversion to evil and wicked people (except for the ones with a fetish for encouraging such people to reform their wicked ways), a voracious species-wide instinct for romantic AND carnal love, a libido that is as high as the heavens, an innate knowledge of the art of sexual activity, ambient mana-emission that not only changes the environment into something easier to live in but also enhances the constitution (read: libido), body, and health of the man who bonds to them through their mana, and of course; a rocking 10/10 body and positively heavenly assets that would not be out of place in a hentai, which is good considering that this IS a work of hentai. A human male whose body has been sufficiently infused with monster energy is called an "incubus," and changes on a fundamental level other monsters can sense, meaning that they also generally respect one anothers' territory and get along (again, unless doubling-up and sharing a man is their fetish).
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