Fate/stay night: Unlimited Blade Works

There exists a plane outside of human concepts, and within there is the Throne of Heroes. Here, the records of the brave men and women whose lives have become legends are kept, to be used as eternal guardians of mankind. When a legend has been venerated enough by humanity they can become immortalized as a Heroic Spirit that surpasses time itself. However the definition of what is a "hero" is broad — even the ruthless and heartless are the heroes of their own tales.
There is a ritual known as the Heaven's Feel where seven Spirits can ally with a Sorcerer Master via contract and become Servants. This ritual culminates in a seven-way war to acquire the ultimate prize, the Holy Grail, which can grant the wishes of the Servant and Master who are victorious. As enemies knowing their true name would give opponents an advantage over them, it is hidden. Instead, each heroic Servant Spirit is given a Class by which they are addressed: Saber, Archer, Lancer, Rider, Caster, Berserker, and Assassin. In addition, each Servant is armed with the mysteries that symbolize their legend — Noble Phantasms, legendary armaments and abilities.
As each Servant falls, the Holy Grail receives their power, until only one remains, and the Grail is ready to grant the winners' wishes. The Holy Grail War that results in this has happened before, with a great cost of human lives, all for that one wish granted by the Grail.

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