Prolouge: Faction Grail War
Two factions fight for the Holy Grail in the Holy Grail War. The Black Faction, to keep it, and the Red Faction, to obtain it. The White Faction members choose sides. The Holy Grail War is a competition where 7 magi battle against each other for a chance to obtain the power to grant one wish. The grail picks 7 magi and emblazes on their hand a crimson mark called command seals. These seals allow the owner to summon a spirit from the Throne of Heroes to fight for them in competition. They allow the Magus the ability to command these noble men and women with 3 absolute orders. However, once they are used, the magus has no claim over the spirit, and can no longer be considered a master. Even without the use of the command seal, the servant will be forced to work with the master, as he is unable to sustain a material form in this world without a source of prana, which the master dutifully provides. To motivate the servants to fight in the war, the grail will also be able to grant the winning servant(s) one wish.
In Ygmillenia Manor, home of the Black Faction, a boy was chanting to summon his servant for the Holy Grail War.
