On the Book, it explain that once in every millennia. For some reason a Demon Lord and it's forces would be raised on this world.
To counter them the hero summoning ritual would be held to summon the savior that would save the world from demons. It would summon a person that will save the world.
How the summoning ritual would be held are like this. There are a temple on human kingdom which has been look after by a certain community of human. There are an ancient runic circle of magic that already exist since primordial time in there. A time of chaos where human are scattered around the world as a small village, a time when a village would suddenly vanish because of a monster stampede, or because of a demon invading. After losing their village some of them would living a nomad life until they found another place to settle down. At that time demon and monster are roaming around the world freely, and human are just a weak creature that could only run and hide from them.
Once a time, a demon which starving because of a scarcity of human around, try to create a summoning magic to pull a bunch of human from another world. But it become a mistake for a life time, and a doom for his race. because when the human that come out from the circle of summoning come. One of the human that come out of that circle are not a meek and weak human that terrify by a mere presence of a demon. One of them fight back and full the other to fight back also. After acclimating them self with this world, they gain stronger body after exposed to the rich mana that exist in this word. some of them gaining a super human strength that made them able to fight back against the demon,
Some of them gaining super human ability to wield element of this world, later then it called Magic. Together, the human start to fight back and finally made a sanctuary, where the human from this world gather and made a kingdom. Years after years human fight back against demon and monster the other hostile creature from this world. Slowly they gain a wider territory to claim and develop, come into contact with another intelligent creature like Elf that live in the jungle where nature mana are abundant, and then they come into contact with Elv that live at the seashore and beach where water mana are abundant, next the human come in contact with the dark elf that live at the rocky mountain, While the Elf and Elv only have wooden spear and arrow as a weapon, the Dark Elf have iron and steel that they smith into weapon and create sword and lance and another weaponry. After joining alliance with human, the four race undergo a peaceful era for centuries and more, additionally after they recruit the Beast Folk into the Alliance. Like human the beast folk also life their life being oppressed by demon and scattered extensively around the world, Together the Human, Beast Folk, Elf, Elv, and Dark Elf form the Five Race Alliance and experience centuries long of peace.
But the peaceful era only hold for a view centuries until the demon come back to invade and attack human, the rise of Demon Lord has made the demon stronger and more united then.
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At first the Human and the Five Race Alliance are able to stand their ground and fight back, until the Demon Lord start to push forward and the Alliance start to lose grounds. After losing much ground and village the human try to initiate the Hero Summoning, by using the former circle that the Demon use to summon human from earth before. At first they are failing and didn't know how to operate the summoning circle, after studying the circle and get a feeling when it activated, they finally understand that the circle can only be used at a certain time, a day and a month that are special. It only happen once every 100.000 years, to make it worse it only happen for a day in the duration of a hour. Lucky for them the next time that the circle could be activated are after a few month waiting.
With hope in their heart, the human and the alliance struggle to fight back and hold on for the summoning ritual to be done. But the result are a disappointing and a catastrophic failure again.
The human that come out from there feeling injustice, they got kidnapped from their former world, and getting forced to fight against the terrifying demon, they didn't have motivation to save the world and end up becoming a burden for humanity and other race. Instead fighting against the Demons Army's. The Summoned Heroes scattered and fight against the local Human Kingdom, Beast Folk Kingdom, Elf Associations, Elvish Colony, and The Dark Elf Assembly, The Heroes fight to claim their own place in this world, but it end up become a collapse of the world order.
The Alliance has been broken and each of races scattered to find a new place to settle down. But among those treacherous Hero that betray humanity's hope, there are one selfless and Brave Hero that decide to save humanity, He alone stand up and defend the humanity's last defense. which is the former castle of demon where the summoning circle reside. That after then reformed into the Temple Of Summoning Heroes.
Days after days, and years after years, the Brave Hero fight together with human and other race's champion to push back and annihilate the demon back to their own territories. Until finally, the Demon Lord has been Slain, and the demon army has pulled back to the Dark Forest.
After that, peace come back to the continent for a moment, the Human contact the other member of the Alliance and then rebuild the Alliance back. Although they didn't settle down near each other anymore. But the Alliance start to slowly rebuild again, but this time the enemy are not only the Demon, but also the rebellious hero that refuse to save the world. It is because this new summoned hero has build their own kingdom and bring forth the system of slavery and racism that cause suffering everywhere, they start to slave around the beast folk and elf and even humans. War after war start to happen around the continent, with occasionally involvement of the demon race in there.
The ground has been cracked everywhere, mountain collapsed, the sea has been surged, until finally the continent has been broken and get separated. Although many of them has been slain, there still other that hide and attack from the back like a coward they are.
Tired for war, the human and the alliance decide come to truce with the remaining of rebellious hero group, and start to rebuild their own territory again. The Brave Hero become the New King of one of the Human Kingdom. And named the kingdom as Victoria Kingdom. and Himself as Arthur Victoria I.