Fate/stay night

Raised by a mysterious sorcerer after the death of his parents in a catastrophic fire, Shirou Emiya has only just begun to learn small tidbits of magic. When he is caught in a battle between two powerful Magi, however, he ends up performing a spell above his expected ability, accidentally summoning a beautiful woman knight to protect him.
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Shirou is thus unwillingly thrust into the competition known as the Holy Grail War where Seven Magi called Masters, together with their spirit partners called Servants, fight to acquire a powerful artifact said to grant every wish.