Fate/stay night

Shirou Emiya has only just begun to learn to use magic, yet when he finds himself caught in a battle between two powerful Magus, he somehow manages to perform a spell far above his expected abilities and summons a beautiful heroic spirit to protect him! But now he and the woman known as Saber find themselves trapped in a secret game of dark magic and duels to the death known as the Holy Grail War. A prize of unbelievable power is at stake, but can the inexperienced Shirou and Saber survive long enough to become real players? They'll have to withstand waves of treachery and assassination as Shirou scrambles to learn everything he'll need to know to stay alive as seven teams of Magus and Servants face off in mortal combat! (Sentai Filmworks)