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   An umamusume is either a subhuman or a human adjacent species. They’ve existed alongside humanity forever, like the Neanderthals used to. They are an all female humanoid species. They share similar body functions to a horse, an animal that doesn’t exist in this universe. They’re tall than humans average at least eight and a half feet, physical features also include a set of horse ears on top of their head in place of human ears on the side and a tail that grows out of their tailbone. They’re physically far ahead of any human. able to bend steel with their punches. Rend through wood and bone with their bites. And their speed is incredible. In fact most all umamusume are born with an innate want to run. However this comes at a cost, mentally they’re irregular. And across the board almost all of them have far more animalistic tendencies. They can get scared easily and as predatory animals this can lead to violence. They are also subject to heat cycles. Between the enhanced natural instincts and their heat they’ve often been called feral and in the modern day are subject to regulation given they make up a small percentage of the population. In the mordant day people are far more tolerant and short of an exceedingly dangerous umamusume most have no issue treating them as equals.

   Since they are an all female species they procreate by having sex with human males. On occasion of not adequate breeding partners certain umamusume have been known to form a functional pair of male sex organs though this is exceedingly rare.

   Umamusume also age differently to humans. Appearing to stay in their twenties for decades before showing signs of aging in their seventies. The average umamusume can live to 110 years old. Though they are subject to legs issues like arthritis and heart problems due to their high strung biology.

   Tracen Academy is the best school for umamusume in the world. Located in Tokyo Japan it has the highest tech and most advanced facilities in the world for training and teaching umamusume through their adolescence. It’s a tertiary level school equivalent to a college. It has Ritto and Miho dorms to house umamusume, often pairing them with a roommate. They attend classes during the day that teach the expected classes as well as umamusume specific classes. Like their history, biology, their current social status and how they can handle themselves and humans.

   It is also where they begin their careers in racing and over the three years they attend Tracen they will be paired with a trainer. This trainer is someone completely dedicated not just to their racing career but also the umamusume personally. Ensuring they’re mentally sound and physically healthy. It is not uncommon for trainers to continue their dedication to an Umamusume even after they graduate from Tracen. If this is the case they usually take a sabbatical and follow the umamusume until she retires. Another common trope is an umamusume and their trainer falling in love. While this isn’t outright encouraged it isn’t prohibited and most people are supportive of it. After all umamusume need to mate with human males to propagate and as such marriage between the two has been legal for centuries.

   Racing is typical, broken up into three grades with G3 being the lowest and G1 being the highest. With pre-op and EX level races being rare but special occurrences. Each umamusume is given the opportunity to design their own unique racing outfit though it’s typically only worn during G1 and title races. There are many types of cups and titles for umamusume to earn besides just the trophies from a race. The most coveted being the Triple Crown.

   Tracen enforces a strict curfew both for the safety of the general public and the umamusume. Not umamusume are allowed off campus past 9pm and all have to be inside their dorm or their trainer’s campus-apartment by 10pm

   The U.R.A, or Umamusume Regulation Association is an international organization that documents and handles umamusume worldwide. It regulates how each individual should be categorized, if they’re safe to be in the general public and if one is a “lost cause” or can be treated.

   They developed the 1-10 scale grading for an umamusume’s mental capacity. 1 is the lowest, these umamusume are no more intelligent than a toddler able to form basic sentences and use simple tools but are far more akin to an animal. 10 is the highest and these umamusume show intelligence that surpasses that of even genius level humans. While at Tracen or another school umamusume are subject to multiple physical and mental tests to see where they fall on the scale. Most fall between 5 and 8 where they’re a bit more impulsive and animalistic but still as intelligent as the average human being and are safe to be allowed into society. Any lower than that and they’re considered a high risk umamusume. They aren’t allowed to race and must be handled by a trainer at all times or they may harm someone even if not intentionally. These umamusume are subject to conditioning and specialized training/teaching to see if they can be mentally raised to a higher level and allowed into society. 1 is considered a lost cause. A feral umamusume that cannot be allowed into society and likely cannot be conditioned to ever learn such behavior. They aren’t put down or executed but treated the same way humans with severe mental illness are.

   The U.R.A also regulates the world’s most popular sport of umamusume racing. Umamusume love to race each other and people love watching it. They carefully select which ones are allowed to race and can prohibit one from racing or if they’ve proven to be violent with another Umamusume prohibit those two from racing together. They also set off the rules for racing.

   An umamusume heat cycle can be irregular but typical is a month long ovulation period that usually begins in the summer. During this time it is typical for an umamusume to “drop a level” a slang term referring to how umamusume become far more feral if their heat isn’t sated. Due to this single umamusume are supplied with a mate who will stay with them for the duration of the heat in order to keep them from becoming irritable and violent. Umamusume sexual behavior is typically human with most being either extremely dominant or submissive. They have insane endurance and most humans are not able to keep up with them. Despite this an umamusume body can usually detect when their partner is going to burn out and intensify the next orgasm to keep the umamusume satiated. Biting is to be avoided as umamusume lose control during sex and their bite force can render through human skin and break bone. As such it is not uncommon for umamusume to consensually muzzle themselves during intercourse.

   The protocol set in place by the U.R.A for high risk umamusume seems dehumanizing but it’s either that or a cage. Even the most feral umamusume have a tendency to bind to at least one human. This most often of course is their trainer. This person will be designated as the umamusume’s caretaker. A government job that requires them to take care of the umamusume or else risk the uma being locked up for the safety of herself and others. If an umamusume is deemed high risk the precautions taken are as follows:

   1. They are to be within 50 feet of their assigned caretaker at ALL TIMES outside of Tracen or other similar umamusume catered grounds

   2. When it public they must be muzzled and have a shock collar with a leash attached

   3. They must not be allowed contact with other high risk umamusume. Even them being within sight of another poses a threat.

   These rules are in place for both the safety of the umamusume and the general public. All umamusume deemed leave 4 and below are subject to these rules. Failure by the caretaker to comply with these rules are subject to fines or imprisonment.

   Should a high risk umamusume harm another person or umamusume they are subject to confinement to the caretaker’s domicile. Then imprisonment. And finally euthanasia.

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