Dark Warden

The episode opens with the last part of the last Holy Grail War with two servants fighting. After that, an explosion was shown and a child standing after the fire was shown. After that, it brings the story back to the present in the home of Rin Tohsaka, a magician who summons forth  hero to aid her in the Holy Grail War. The defective summoning brings forth Archer, who due to the defective summoning didn't have any memories of his life. After this, the scene shifts to the backyard of Emiya Shiro. the protagonist of the anime.

Emiya Shiro  is a typical student and a part time mechanic at that. However, he has a secret. He is a magician. He is the son of Kirutsugu, well actually he is the adopted child of Kirutsugu, who is a magician from the recent Holy Grail War. However, Shirou is only familiar with the spell of reinforcement.

Shirou and his friends are alarmed that a series of crimes had been happening in the city where they live, Fuyuki City. Then one night while he was in school, he chance upon a person in blue who turned out be a hero, Lancer. Lancer attacks him and he was stabbed because he could not afford to be seen. Rin Tohsaka arrives at the scene and revived him with the help of her jewels. Archer and Lancer then had a short battle. Afterwards, Lancer catches up with Shirou and tries to kill him. However, a mysterious light covers him and before him a woman in full armor stands before him calling him master