Literature / Monster Girl Doctor

A doctor and his lamia assistant.

Monster Girl Doctor is a Light Novel series written by Yoshino Origuchi and illustrated by Z-Ton about a doctor named Glenn Litbeit and his lamia assistant, Saphentite "Sapphee" Neikes, who run a clinic in the town of Lindworm.

Shueisha published ten volumes of the series under their Dash X Bunko imprint from June 24, 2016 to March 25, 2022. A manga adaptation by Pixiv artist Tomasu Kanemaki began serialization online in Tokuma Shoten's Comic Ryū Web magazine on February 26, 2018. An anime television series adaptation by Arvo Animation aired from July 12 to September 27, 2020, with the first episode receiving an earlier screening on July 4. Crunchyroll simulcasted the series. The first episode can be viewed here.

The series is licensed in North America by Seven Seas Entertainment.

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Monster Girl Doctor provides examples of:

• 2D Visuals, 3D Effects: The anime adaptation utilizes a lot of CG for the monster characters, with it getting very noticeable at times. For the most part, it's used for the most monstrous parts of them, such as the tail of a lamia or the horse half of a centaur, and even then only for certain scenes, but the fact the fairies are constantly rendered entirely in CG really sticks out.
• Adaptational Early Appearance: Kunai and Skadi show up during The Stinger of episode 1, running into Lulala coming up to the surface, when the duo wouldn't make their first appearance in the source material until the arc after hers. That said, in the light novel, Lulala mentions that this did happen, with the anime simply adding an extra scene to show the exact moment.
• All Women Are Lustful: Downplayed compared to some settings, but it's clear quite a few monster girls experience and showcase very strong sexual desires, to the point that attempting to force yourself on a loved one is not seen quite as negatively as it would be for an average human:
  • Tisalia outright states she takes a lot less of an issue with Arahnia trying to force herself on Glenn, than she does with her claiming she has no feelings for him while doing so.
  • Arachne are noted to have in the past often captured men to ravish and feed on their sexual fluids. While they've mostly abandoned being so openly predatory in the present, they still refer to getting a man as "catching" him and for unwed ones, the mere presence of a human male can cause their lust to obviously flare-up. As a species, they generally prefer "submissive" husbands who they can direct their lusts at as much as they want, whenever they want.
  • Alraunes are noted for having extreme sexual appetites (though the main alraune character's level of lust may not necessarily reflect the whole species, it certainly is true for her and her daughters), particularly toward men but also toward women and sometimes even animals (though this is apparently less bestiality, and more a matter of insects pollinating them and such).
• An Arm and a Leg: Kunai ends up losing an arm, and later a leg, while fighting bandits. Given she's a flesh golem, the damage isn't permanent, but Glenn still has to locate and restitch the missing limbs.
• Artistic License – Physics: Sapphee sees some people approaching the clinic through a closed window curtain using infrared vision. Both the curtain and the glass are opaque in the infrared spectrum.
• As You Know: Sapphee and Glenn have several conversations where they explain things to each other they both already know for the sake of exposition. Sometimes they even just talk to themselves for no apparent reason other than to reveal exposition. In the novels, the information from the exposition is often instead given directly to the reader as an explanation or introduction rather than having any specific character say it:
  • In the first episode of the anime, after Glenn casually comments that Sapphee knows him well, she replies that it's obvious, since they are Childhood Friends and went to school together. With the way she explains it in detail, when they were alone together, it almost sounds like she thought he forgot about those facts and needed to be reminded.
  • In episode 2, they both talk about Lindworm's history in being a place for humans and monsters, as if that wasn't already the reason they work there in the first place.
• Ass Shove: Downplayed, as it's a different organ and opening entirely, but the imagery is still there when Glenn examines Arahnia's spinneret.
• Awkwardly-Placed Bathtub: Justified. A slime girl Glenn treated needs to stay submerged in some special water for a few days, so she gets around by putting the bathtub on wheels and is moved around by a servant.
• Back for the Finale: Episode 12 of the first season for the anime has almost every notable character introduced so far show up in some way, including several of the unnamed extras. The sole exception is Cthulhy, most likely taking a break in order to recover from having all of her tentacles burned to a crisp during Skadi's surgery.
• Beast Man: Some of the animal-based monsters are this.
• The Big Damn Kiss: Volume 10 concludes the series with Glenn and Sapphee at last locking lips as they wed, accompanied by the final illustration of the series showing it, for what is noted to be a long kiss.
• Breeding Slave: Some human slavers may use harpies as slaves, selling the unfertilized eggs they routinely lay, which go for high prices to certain humans, and potentially breeding them to make more harpies to make more slaves. Luckily for the harpies, the slaver group encountered in the series is broken up and rehabilitated before they can become desperate enough to stoop to any crimes greater than kidnapping and confinement.
• Childhood Friends: Glenn and Sapphee met each other when they were kids before reuniting at the Academy in the monster territory. Sapphee is hoping to make it a Childhood Friend Romance, but since Glenn wants to avoid losing Cthulhy's support by breaking her rules, he's not very keen on accepting her advances at the moment.
• City of Canals: Lindworm has many canals to accommodate many of the aquatic monsters, including part of the town that functions as an Underwater City.
• Constructed World: The planet of Monster Girl Doctor, more specifically the continent the series takes place on, vaguely resembles East Asia, at least from what's shown in the maps, but is a full fantasy world where the presence of monsters and the supernatural have been commonplace since the beginning, though still filled with Fantasy Counterpart Cultures as is common in these stories.
• Cute Monster Girl: It's right there in the title. Every single monster girl in this series is quite cute and attractive, especially the ones in the main cast. That said, it's not like the boys miss out, as while most of the monster guys are more monstrous in appearance, for a decent number of them that extra monstrousness does nothing to detract from them also being quite attractive.
• Defiled Forever: Played for Laughs when some of the girls say this upon being subjected to some of Glenn's most intimate examinations.
• Deconstruction: Much like its inspiration Monster Musume, Monster Girl Doctor spends a good amount of time exploring the anatomies of the various monster species and how they would interact with the world around them:
  • Mermaids are amphibious, but to breathe air, the pleural cavity needs to be shut. If any of their gills are open, then they cannot breathe air properly. Lulala learns this the hard way, since she spends most of her days on land singing for money, instead of in the water, as mermaids are ultimately fish.
  • Gigas have the strength to match their size, and as even the simple act of walking can cause a noticeable tremor per step, they often stay put unless they absolutely have to move. They also have an extremely low metabolism, which while it has enabled them to live without eating an extremely large amount of food for their size, it also makes recovering from illnesses like the simple common cold take much longer, as Dione spent 10 years with it.
  • Dragons have extremely tough bodies, but that same Super-Toughness also makes it hard to perform surgery on them.
  • Lamias' mouths and tongues being evolved to be like that of snakes (i.e. breathing whilst swallowing whole objects, having their tongues stored in their throat when closed) which has the potential to enable bacteria to stay inside the space that holds their tongue, meaning that even a simple bacterial infection in their mouths could spread while the tongue is stored in the throat, and in the worst cases it could spread to the lungs and cause pneumonia.
  • Humans with demonitis have Super-Strength inherited from their demon/oni blood, but using their extra strength also causes their bodies to heat up rapidly, making them prone to dizziness and worse from overheating if they do not take measures to moderate the use of their strength and cool off.
  • Spinning silk is taxing on an arachne's nutrients, to the extent that making silk too much without letting their body recover puts them at risk of malnutrition and even death. There's even a term for this: Mourning Silk Syndrome.
  • While Lindworm is more or less accepting of monsters (by virtue of being a trade city), they don't have it so easy elsewhere, such as in the East, if Sioux is any indication.
• Does This Remind You of Anything?:
  • The moans the girls let out when Glenn is treating them sound less like pain and discomfort and more like sexual arousal. Then there is the way Sapphee wraps her tail around Tisalia's body and shoves the tip inside her mouth to get her to stop struggling.
  • Besides the sexual innuendo, Tisalia's initial reaction to being told she needs horseshoes is evocative of a child being told they need to see a medic they are afraid of, like the dentist.
  • Glenn fixing up Kunai takes this the farthest out of all the girls. Since she has no sense of pain but does have a heightened sense of touch when it comes to being handled gently, she genuinely gets aroused from Glenn reattaching her leg thoroughly, to the point of her experiencing an immodest orgasm. There's even a few shots that make it look like Glenn is using his hands on somewhere a bit more "delicate" than Kunai's leg.
  • Glenn helping Illy with getting an egg unstuck from her oviduct is portrayed like he was helping her give birth the mammalian way. While the processes are already pretty similar, the egg being stuck causes the effort in getting it out to make her convulse and groan in pain like a baby stretching the vaginal canal in a live birth.
  • The monster girls covered in Arahnia's silk look as if they have been covered in something else.
  • Arahnia helping Sapphee get dressed due to being sick is framed in a way that makes it look like they were having some skinship bonding until it's revealed what's actually happening.
• Dress Hits Floor: When Arahnia is helping a sick Sapphee getting dressed, we get a shot of Sapphee's clothes sliding to the floor and pooling around her tail, followed by a Toplessness from the Back shot with Arahnia measuring her up for her clothes.
• Extreme Omnisexual: Alraune produce a nectar that has strong seductive effects on men, and they show a marked preference for men, but are capable of reproducing with a wide variety of plants and animals through either pollination or fertilization. This is downplayed in that they don't do objects.
• Fantastic Arousal: Most of the Cute Monster Girls have at least one rather pleasurably sensitive part of their anatomy that Glenn ends up having to touch or examine:
  • The first scene has Glenn examining a female minotaur, who gasps suggestively when he starts touching her ears.
  • Centaurs are apparently sensitive in their hooves, with Tisalia being mortified when Glenn has to groove them and install horseshoes on her and begs him to be gentle. Sapphee, Kay, and Lorna have to hold her down to get her to stop writhing while she moans suggestively.
  • While the flesh golem Kunai doesn't feel pain, she appears to have heightened sensitivity in the edges of her limbs, and contorts in pleasure when Glenn examines them. When he stitches her leg, the extensive contact is so much it ends causing her to have The Immodest Orgasm, much to her embarrassment, though Glenn is kind enough to ignore it. Both she and Glenn suspect she's this way because the Mad Scientist that made her was mentally sick in more ways than one.
  • Skaldi's draconic form has both her wings and base of her tail as extremely sensitive spots, and is heavily implied to have had an orgasm in her outfit when he does a thorough examination on them. Leads to a Not What It Looks Like moment when Kunai and Sapphee end up walking in on them right at that moment.
• Fantastical Social Services: Glenn's clinic specializes in treating non-human patients. The narrative goes to great lengths to describe the difficulties their physiology cause that necessitate specialists like him to treat their ills.
• Fantastically Challenging Patient: The novel centers around Glenn Litbell, a human doctor who specializes in treating non-human patients, from lamia to mermaids to gigas and everything in between. The series goes to great pains to describe the difficulties that these monster girl patients have due to their biology, requiring the aid of a specialist to treat them.
• Fantastic Racism: Monsters are treated horribly in the East, to the point that Van Helsing Hate Crimes are commonplace there, which was why Glenn's sister Sioux, a human who turned into an Oni, left for Lindworm. Outside of Lindworm in general, humans and monsters still tend to be prejudiced towards each other.
• Fantasy Counterpart Culture: Similar to its inspiration Monster Musume, lamias appear to be modeled after Arab/Middle Easterners, while harpies appear to be modeled after Native Americans. Meanwhile, vampires are clearly modeled after Eastern Europeans.
• Feeling Your Heartbeat: Played with. Glenn conducts a private examination of Skadi, who suffers from a progressive illness and has lost the will to live. She has a hard, bluish growth directly over her heart, which throbs in rhythm with her heartbeat. When Glenn touches this growth, he's surprised by its hardness, worrying that it's a malignant tumor beginning to ossify. While his intentions are perfectly innocent, him touching the tumor, and then continuing the exam along her tail and wings, causes her a great deal of Fantastic Arousal, which infuriates Kunai when she walks into the room and sees Skadi mostly undressed and crying. Sapphee, who had walked in with Kunai, also lampshades how the situation appears.
• First Girl Wins: Played with. At the end of Volume 6, Glenn officially proposes to Sapphee, paperwork and all, to her great joy, albeit marriage itself will have to wait until their clinic pays off its debts and becomes self-sufficient. However, right after this, Skadi, in part motivated by Glenn and Sapphee becoming official, pushes through a (admittedly already being pushed for) amendment to Lindworm's laws, making polygamy legal. As such, Tisalia and Arahnia approach with their own marriage certificates that Sapphee had earlier made for them in the belief that Glenn should choose one of them as his brides. They're fine with being the second and third wife, respectively, and Sapphee can't argue against their points that she did leave Glenn to them earlier. Furthermore, Glenn admits the only way he could refuse would be to say he wasn't interested in them, and that saying this would be a lie. What's more, with polygamy legal, there are still a lot of monster girls hoping to add themselves to the harem or at least have a brief fling.
• Florence Nightingale Effect: Several of Glenn's patients end up being attracted to him after he treats them.
• Forced Orgasm: A few of Glenn's patients are implied to experience an orgasm when he has to examine some of their bizarre body parts that are rather sensitive for their species. The most explicit being Kunai, who feels extreme sensitivity in the edges of her limbs, and is mortified when the process of Glenn stitching back her limbs causes her to orgasm, although she ends up respecting him as a doctor for remaining professional during the procedure. Later, Glenn comments that the Mad Scientist that made her this way was mentally sick in more ways than one.
• Great Off Screen War: Played with. More than a century before the events of the series, a huge war between the humans and the monsters began, the specific reasons lost to time. However, over the decades, the two sides grew more and more tired of fighting, to the point that in its waning years the "war" consisted of little more than skirmishes between hired mercenaries and various token shows of force that resulted in fairly little bloodshed. The war becoming a war mostly in name only afforded many opportunities for both factions to prepare for and make use of the peace that was likely to come into play soon. The official end of the war led to a peace treaty between the two groups a decade prior to the events of the series, and Skadi reforming a former fortress city into the great city Lindworm, a place where the fruits of monsters and humans coexisting could be explored.
• Has a Type: While the all-female arachne species can also reproduce with monster males of various species, Arahnia notes that arachnes have a marked preference for taking human men as husbands. This is because, as she puts it, "human men are small and easy to catch, and they are timid and submissive". In the anime version, a unnamed arachne ogling Glenn is the one who says this instead. This appeals to the dominating, hedonistic nature of the arachnes, who know they'll be able to work such accommodating men hard (sexually) for the rest of their lives, while male monsters can be more unruly. When Glenn enters a building full of arachne workers, he is immediately the subject of the predatory gazes of the unwed ones.
• Hero's Slave Harem: Discussed between Kay, Lorna and Glenn. Kay and Lorna are the attendants of Tisalia, and describe themselves as their lady's "property" under centaur tradition. When alone with Glenn, the two of them try to seduce him, knowing that their mistress is in love with him, under the logic that if successful, Glenn would have no choice but to marry Tisalia in order to take responsibility. When their attempt fails, the two are unfazed and state that they only see it as a matter of time before Glenn marries Tisalia, and since centaur law dictates that spouses share all property, then that will make them his property as well, which they are very excited about.
• I Didn't Mean to Turn You On: A recurring Running Gag in Glenn's medical examinations is for him to unintentionally arouse his patients, usually due to having to examine an sensitive body part, leaving them gasping and panting while he does his best to Ignore the Fanservice.
• In the Hood: All of the slavers use black hoods that cover most of their faces, even while fighting.
• Inherently Attractive Profession: Part of the reason so many girls end up attracted to Glenn is just due to the glamour of his profession as a doctor. Tisalia even claims she was considering him as a suitor before she even met him just due to him being a doctor.
• Jerkass Façade: Glenn's elder brother Souen is a self-serving and seemingly amoral force in the series until the end of Volume 6, wherein it's revealed many of his actions were motivated to push his siblings into doing the right things even if it meant they hated him for it, and that he is working behind the scenes to help monsters and humans with monster blood to gain acceptance in the East. He's also doing this in large part so he can marry a woman he loves with demonitis and she can walk freely in their homeland. He's so embarrassed to admit the truth about himself that he makes sure that only his siblings are witness to it. He is still noted to have a rather twisted personality, though.
• Kiss of the Vampire: Vampires in this series have a special saliva that serves not just as an anticoagulant, but also a drug that fills their prey with pleasure and a sense of comfort (the vampire themselves may fall into an ecstatic daze during feeding as well if the specific blood is really to their liking). Glenn finds out the dangers of this when he offers his blood to help the vampire named Plum heal her wings (her injury causing her desire for blood to spiral out of control) and she ends up sucking him into unconsciousness through his fingers despite Sapphee monitoring things. All involved underestimated just how much she could suck out and how quickly thanks to the anticoagulant.
• Knew It All Along: Sapphee is tormented about Glenn finding out about her Dark Secret of her actually being an assassin when she was sent to his house, but then he reveals to her that he knew it all along and didn't think it was a big deal since everything turned out okay and his own family were willing to go to similar lengths if necessary.
• Let's Meet the Meat: invoked There's a restaurant where scylla and kraken cut off and cook their own tentacles. Cthulhy even repeatedly tries getting Glenn to eat one of her tentacles. Glenn knows such monsters consider it a normal thing and nobody gets hurt, but can't help being squicked out by the idea of eating part of a sapient being.
• A Lizard Named "Liz": Similar to its inspiration Monster Musume, some characters have names that are in reference to their species, such as Saphentite Neikes for lamias, Arahnia Trantella Alakunida for arachnes, and Aluloona Loona for alraunes.
• Long-Lived: Some monster species have very long lives. For example, Scylla are noted to live for centuries, while dragons and gigas can potentially live even longer. Vampires are shown to use their long lives and great power to exert societal influence, as they are more likely to get involved in the affairs of other monster species than dragons are, with species under their backing/protection gaining authority and unity that they previously lacked.
• Marry Them All: While actual marriage is put on hold until he's out of Cthulhy's debt and becomes financially self-sufficient, Glenn gets engaged to Sapphee, Tisalia, and Arahnia at the end of Volume 6 after Skadi alters the city laws to make polygamy legal. All of the girls are quite happy to share him, and Glenn cares about and cherishes all of them too much to only chose one.
• Maternity Crisis: Glenn has to help Illy get an egg unstuck from her oviduct while they're being attacked by slavers, with Sapphee having to fight them off while keeping them safe.
• Morton's Fork: After the surgery, Skadi shows her scar to Glenn by opening her cloak and teasingly asks him if the sight of her naked body turns him on, with Kunai questioning him on if it truly does. After Glenn replies that it doesn't, Kunai demands to know why he doesn't find her master attractive.
• No Place for a Warrior: Most of the slavers were human mercenaries that ended up without a job after the Great Off Screen War ended.
• One-Gender Race: Largely averted despite being a monster girl-focused setting, with even traditionally all-female species like lamias and harpies having males of their own (though many monster species can and do reproduce with humans, one of many mysterious aspects of their biology). Arachnes are the one known exception, explicitly described as being all-female and always giving birth to arachne regardless of the species that impregnates them. In volume 8, alraunes are implied to also be all female (or at least somehow Aluloona had nothing but alraune daughters 30 times), but with the ability to give birth to things other than more alraunes.
• Our Demons Are Different: As of yet no succubi, devils, etc. have appeared in the setting. Instead, the term "demon" is associated with monsters that used to live in the far East where Glenn originated. They were essentially Japanese oni in everything but name, right down to their high tolerance for alcohol. In the present, they no longer exist in any pure form, having been driven away/killed off by humans long ago, with any survivors theorized to have interbred with the ogres that are still common in other regions. However, their blood also lives on in various human families that interbred with them in ancient times. In such families, puberty causes a select few to grow horns (the purpose of which is to let off excess heat created from exerting themselves), exhibit superhuman strength and various other oni abilities. The condition is considered a curse/disease in the monster-hating East and called Demonitis, sufferers being often ostracized and driven from their homes. However, there no cure or treatment since at its heart it is simply a natural consequence of the special monster blood they carry. The horns can be cut off, but this leaves large scars and their oni abilities will remain.
• Our Dragons Are Different: In this setting, they originated as beings close to gods who dwelled in heavenly realms, the four varieties distinguished by their type of Breath Weapon or lack of one. Should they descend and spend enough time in earthly environments, their bodies change in many radical ways, becoming the wide range of dragons found in real-world mythology. Some even are able to freely shift into a humanoid form, or, in Skadi's case, take on such a form permanently.
• Our Fairies Are Different:
  • Fairies in this story look mostly the same as in stories, being small enough to fit in somebody's hand and having insect-like wings. However, they also seem to all have traits of House Fey, with them enjoying working for others and taking milk as payment. Mentally, they are noted to be rather like communal insects, with relatively little in the way of individual personalities.
  • A chapter from the perspective of a fairy reveals at least some of the impressions monsters and humans have of them are inaccurate. They are, at least by their own standards, incredibly intelligent and powerful (supposedly having been able to fight gods in the past) and serve other races mainly because the fairy queen has commanded them to (and they also see it as an obligation to "help" the "lesser" species). To them, fairies are the supreme species, all others are inferior, primitive, stupid, etc. In their view, the one thing fairies lack is much ability in verbal communication, which they regard as primitive anyway. They use telepathy with each other, but with other creatures they can only manage simple, child-like speech. How much of their superiority is genuine and how much is simple hyperbolic boasting is unclear, but at the very least they claim to never age and to be able to heal from any injury if they return to their homeland. They do not reproduce in a conventional way, and though they have genders they don't have sexual desire, though they have some understanding of it.
• Our Vampires Are Different: In this setting, they are superhumanly strong, nocturnal, long-lived bat-like monsters that subsist mainly on fruit juices, but get a strong craving for blood if they are weak or injured as blood helps them heal more quickly. Different vampires have different tastes when it comes to blood. Many use animal blood without issue, but Plum can't even stand the smell of it much less the taste. However, she finds Glenn's blood is tastier than anything she's ever had before and basically sends her into ecstasy.
• Out with a Bang: Alraunes are quite capable of inflicting this on a man via just how thoroughly they can drain sexual (and other) fluids, albeit he'd have to get seriously on the bad side of one to have a risk of it happening. Normally the worst one can expect is to simply be emasculated for a time from the intensity of it all.
• Patient of the Week: Almost every episode or arc features a monster Glenn has to treat, and the patient will usually become a recurring character afterward.
• The Phoenix: The phoenix is a legendary firebird that has many a myth spun about it due to how mysterious it is, such as whether or not it is actually immortal like many believe. The phoenix in this story also takes cues from the Fenghuang, often called the Chinese Phoenix, with its beautifully multi-colored plumage. Illy turns out to be a blood descendant of the phoenix, which not only results in her gaining the same multi-colored feathers after entering adulthood, but also causes her new feathers to be filled with the heat of its flames.
• Plant People:
  • Alraunes are a race of flower-like monsters, with the humanoid body supported by a large flower-like lower body/bulb. They produce a scent with a beguiling effect on men, and nectar that is an aphrodisiac for men and a beautifying treatment for women. They also tend to have very high sex drives, especially when "in bloom" (essentially being in heat). They are notably able to be fertilized by a wide range of other life forms. They are also able to retract themselves into their bulb to fit into smaller spaces.
  • Dryads are tree-like monsters with a strange life cycle. Nimble and active when young, they become stiff and sluggish with age until they lay down roots, stop moving and talking, and become almost the same as real trees. Old dryads are noted to look forward to finding a place to lay down roots.
• Pragmatic Adaptation: The anime adaptation heavily condenses and changes up a lot of content from the source material, with each of the arcs, which took up at least three chapters a piece when adapted to the manga, being fitted into one 22 minute episode each. It also changes the ordering of a few events, such as detailing most of Glenn and Sapphee's backstory, though omitting the detail about the assassination plan from Sapphee and her family before Lulala's arc, when that wouldn't be mentioned until two arcs later.
• Proud Warrior Race: Centaurs are a warlike race, with several of them working as mercenaries in the Great Offscreen War.
• Rock–Paper–Scissors: There's a variant from Glenn's homeland called Horse-Snake-Spider (Horse steps on spider but is swallowed by snake, while spider catches horse). Glenn briefly considers suggesting a round to settle an argument between Sapphee (Snake girl), Tisalia (Horse girl) and Arahnia (Spider girl), before reaching the conclusion that that would be really inappropriate.
• Seduction as One-Upmanship: Arahnia the Arachne has a habit of wanting what other women have, as the drama and stimulation inspires her artistry. As such, she seduces other women's husbands and boyfriends, only to dump them before the relationship turns intimate. At the start of the series, she turns her attention to the protagonist, Glenn Litbeit, the crush of her best friend, Saphentite. Despite her unwillingness to be intimate with other men, when she captures Glenn in a web trap, she considers raping him before Saphee can have him both to see how Saphee reacts and under the logic that she and her friend will "share" something and grow closer. However, over time, she she genuinely falls in love with Glenn herself.
• Seductive Spider: Arachnes are infamous for aggressively seducing human men. This is because the vast majority of their species are turned-on by the fact that human men are weaker and afraid of them. In the days when humans and monsters were enemies, arachnes would intentionally lay webs in places humans frequented so that they could literally abduct a mate. Even in peacetime, the Race Fetish is so strong that when Glenn walks into an arachne textile shop, every single woman in the building immediately gives him their undivided attention.
• Sexy Dimorphism:
  • True to their mythological depictions, male minotaurs have a bull's head. Female minotaurs are Little Bit Beastly with cow ears and horns.
  • Mermaids have what resembles human skin on their human half, whilst mermen have fish scales covering their entire body.
  • Cyclopes go for two sexy extremes. Male cyclops are about one size larger than the average male human and very muscular. While the race is considered a type of giant, the females are mostly human-sized and well-endowed (but with large hands and more physical strength than one would expect).
• Sick Episode: Technically speaking given this is a series about a monster doctor who treats patients on a regular basis. Special mention goes to the final episode, with Sapphee herself getting sick and needing Glenn to treat her.
• Skyward Scream: The camera pans to the sky as Tisalia screams while horseshoes are being installed, and we get a Time Lapse to the morning after.
• Small Role, Big Impact: Because an unnamed maid tried to poison Sapphee, which rendered her bedridden, this led to Glenn wanting to become the doctor he is today.
• Truce Zone: Due to being a major trade city for monsters and humans that was reformed by the immensely powerful Skadi to be so, Lindworm is such a place. Unlike most of the world, where Fantastic Racism is abound aplenty, especially in the East where they are outright persecuted and hunted down, monsters from all walks of life coexist peacefully and happily with humans in Lindworm. That said, there are several groups that desire to subvert this peace, though even then many of the citizens are fully willing and able to fight for their peaceful life.
• Underground Monkey: Within a given "species" of monster there are often many varieties with various different attributes. Most of these only get mentioned in passing in the light novels, though sometimes main or recurring characters can have at least one of the special attributes or be a special type:
  • Lamia include varieties with venomous bites, as well as ones with rattles on their tails (to accentuate a tail shake many lamia do when irritated enough). Albinism is also noted to be fairly common in lamia, such individuals having led largely nocturnal lives until sunscreens and protective, yet practical, clothing became widely accessible.
  • Dragons are noted to have originally consisted of only four varieties, distinguished by their type of Breath Weapon (water, fire and poison) or lack of one, but upon coming to live on the surface world this first generation of dragons became altered drastically in response to their environments to the point that the average person thinks there were always many kinds of dragons. These current varieties include wyverns, wyrms, naga, orochi and mizuchi. Some remained giants, others became humanoid, and still others have the ability to switch between the two. Some even chose to live in environments or ways that caused them to lose their intellect and become nothing more than monstrous animals.
  • Scylla and kraken are closely related, the latter having ten arms instead of eight and a fleshy protuberance on top of the head that resembles a squid's pointed mantle.
• Underwater City: Part of the efforts to accommodate more monsters in Lindworm was flooding the abandoned slums so that aquatic monsters could live there, which also brought a bonus benefit of the area turning into a tourist sight.
• Undressing the Unconscious: As a doctor, Glenn has to do this to reach a patient's injury, such as having to cut open Memé's shirt to treat her, which caused the shy cyclops to have a delayed Naked Freak-Out when she finds out.
• Vow of Celibacy: Cthulhy set up a few house rules for Glenn and Sapphee when she decided to financially support Glenn's medical efforts and give them their own clinic, a privilege she has not granted any of her other students. The main one is an anti-fraternization rule, where if the two ever "tie the knot", she's cutting her support and kicking them out. Sapphee is more annoyed than concerned about the rule and frequently looks for opportunities where she can justify breaking it, but since Glenn wants to keep his clinic open and continue getting money from Cthulhy, he deliberately avoids Sapphee's advances. In fact, it seems Cthulhy's rule extends to at least attempting to keep Glenn from having sex with anyone, implied to be partly because she still has hopes to snag Glenn for herself and doesn't want anyone to get ahead of her. This rule seems to mostly be abandoned later in the series, as Cthulhy has no particular objection to Glenn's plans to marry Sapphee, Arahnia and Tisalia, though Glenn still seeks to become financially independent before he actually marries.

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