Shirou Emiya discovers himself a resistant participant in a dangerous competitors where 7 Mages mobilize brave spirits as slaves to battle each other to the fatality. They compete for the possibility to make a desire from the Holy Grail, which has the power to approve any type of desire. Shiro is unskilled as a mage as well as knows nothing of the Holy Grail Battle, yet he as well as his slave, Saber, become part of a short-lived collaboration with another Mage, Rin Tohsaka. Nonetheless, issues occur between Shirou as well as Rin's servant, Archer, that appears to seriously abhor him.