Fate: Why Are There So Many Beasts in This War?

Chen Mo transmigrates to Fuyuki in 2004 and is invited to take part in the Fifth Holy Grail War. He thought that, given the series' usual tone, he could stay alive just by sticking close to the protagonist... What do you mean Shirou Emiya and Rin Tohsaka aren't Masters? And where did this eggplant kouhai claiming to be from Chaldea come from? A king who observes the future, a god who creates worlds, a director watching over human order... Why are there so many Beasts in this Holy Grail War?!