After the last failure from summoning hero, the circle of summoning hero has been researched and modify for a better successfully summon. The circle magic of summoning work by borrowing the power from a greater plane.
When this planet and it's moon line parallel into it's star in other word a solar eclipse has happened on the Altar, and then the nearest star coincidentally move into line with the sun in this planet, and then the other nearest star also coincidentally form a line from the former star through the current star into the next nearest star, it will keep going until it reach the sun on earth. It will create a bridge that necessary for the summon. After then the magic will borrow the power from god realm to send a mana net that marked random individual on earth, it will be spread across the globe sporadically without any rule or order. and manifest on earth with many form.
Some will take a form as a stone with epigraph will showing later, or a nice looking crystal that would suddenly shown a scene after scene later, or a sheet of brochure that will show the story later, or maybe just a sheet of paper and sometime book. The key on this are the marked individual need to picked their certain item for a greater chance and power when they got summoned. This item will be greatly enticing to pick by the marked individual, usually they will pick them but end up throwing them away because they lose interest.
In Rudy case the mana net has marked him right after he came to his room and search for the manga, it slip by a windows and suddenly materialize as a white book.
The researched for optimizing the summoning magic circle can't get rid of it's defect, which is that circle of summoning hero magic will summon many person from earth to this world. Trying to limit the hero to one or two person will need to overwrite the magic circle, to interfere with the god's provision and then trace back the path of the one that didn't needed, to send them back home. It didn't as simple as throwing a fishnet, and catch a particular fish that you want. And then throwing back the fish that you did not want. Thus fish will got lost and got separated from his habitat.
Either way, to trace back where the summoned come from, it will need an expert in a space and time magic for each summoned hero, which is impossible, looking at the sheer number of summoned hero that come, and also no mage have able to touch a realm where they able to trace back where exactly the summoned hero come from. It also a wasteful attempt that it will better to not do the summoning ritual at all.
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At the end, the research result is a way to filter the summoned hero which will appear on altar and the rest will be banished to The Great Forest.
The filter will work by adding a programmed Illusion Magic on the summoning magic circle, and operate by many mage that is on standby. Right after the summoning circle activated the amount of other worlder will be known, by putting a sufficient amount of mage to handle four to five other worlder for each of mage at the same time
When they about to enter into the altar the Illusion Magic would showing them a scene where they will be summoned into the Altar alone, in front of them are the First King Arthur Victoria I, that will given explanation about the summoning hero from the other world, that it is at random and when you got here that mean it would be your fate to become the hero of this world. Around the hero candidate, the king's attendant will hailed and beg the hero to save their world, and then the hero will be asked to be the savior of the world by the King. To forget their past world and accept this new world as theirs. if they decline they will immediately added to the banished list that's going to the Great Forest. If they accepted then the illusion will go on and show a demon broke in to the summoning room, their reaction will determine their fate.
If they run away and abandon the people around them, or if they just watch and avoid going to near the demon they will be added to the banished list, If they come and try to protect one of the people around him, they will be pass as a hero candidate, if they just stand and watch without doing anything for a while, there will be possibility that they realize that all of this are just illusion.
So the final test will be when the demon would suddenly run into the candidate to slash them, if they avoid them. it would mean that they believe there is a possibility that all of this are real and they cruelly let all those innocence people died. So, they will enter the Banished List. But if they let the demon slash them, no matter either they shield against the demon with their hand or not, they will pass as a hero candidate also.
It is cruel to dump them all to The Great Forest, but the world need a Real Hero, not a cowardly hero that abandon people, not a hypocritical hero that will cause suffering to the people. Either way, there are no way for sending them back to their former world. So, the human on this world didn't have a choice but to banished them to a far away place. As for not doing any summoning ritual at all, it also couldn't be done because the tempting chance of gaining another Brave Hero are just too much to miss for another 100.000 years.
The filter of the hero happen at the same time, to be precisely, it happen at the same time on the way before they are arriving at the Altar, in about 2 minute before they arrive at the altar the illusion will work