Beast world is mainly divided in four continents-
In Eastern side side of mainland reside tropical jungle , in Western side desert reside , whereas in Northern mountains with snow all year round and southern side there is a vast sea.
In every different continents different animals live suitable for their sorrounding and they are hostile to each others . The only common thing they have is low number of females.
In beast world,male beast reside who can change their form between their animal and human form but female beast cants transform and always live in their human form. The ratio between female and male in beast world is per female their is 20 males or more.
As female can't tranform to their beast form they always live in human form so they are very weak and due to their low number their value increases in every continent.
So females for their protection and to reproduce many cubs they take many mates after their first estrus at the age/season 16.
Females have their first estrus once every year and that week is very precious for them as they have to continue their mating during that time to ensure pregnancy and if they don't mate they will just take any random male to mate as hormone are at their peak and they are not in their sane state so their mates always accompany their female during that time and even after that, to became successful pregnant is very difficult.
So females with high no. of pregnancy . Are always sorrounded by males who want to be their mate .
Tattoos are formed on female body after mating , the more love a female have for their mate ,the closer their tattoo will be to their heart and they can feel their emotions through bond (mostly males) . And females who are dissatisfied with their males ,they can break their bond by cutting of their flesh but for males they can only take one mate in their lifetime and incase their female break their bond he will lose his sanity and became rogue and sometimes they will lose their life from huge pain.
Rogue are those beast who have their bond broken by their mate or if their mate dies and after they became rogue they will lose their ability to feel and they are no different from normal animals who follow their instinct instead of mind. They will live in groups and attack villagers for food and their instinct to kill.
Their also live feral beast who are prohibited from entering beast city or any village as they force female to take them as their only mate and even kill them they are born with those traits ,so males always accompany their female for protection.
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The world Elena live is a beast world from a certain novel in which an American girl is transported from her world and she is just a minor extra character who is only describe in few lines of pity to show the heroine how dangerous this world Is for single females.