These heroic spirits or servants are: Saber, Lancer, Archer, Rider, Caster, Assassin, Berserker.
Each master will enter into a contract with their assigned servants and battle the other masters and servants to the death until only one pair remains...
They are bounded by the basic law of alchemy: in order to gain something you have to sacrifice something of the same value.
Japan's rights and identity were stripped away, the once proud nation now referred to as Area 11.
Its citizens, Elevens, are forced to scratch out a living while the Britannian aristocracy lives comfortably within their settlements.
To get back what they've lost, the brothers embark on a journey to find the Philosopher's Stone that is said to amplify the powers of an alchemist enormously; however, on the way, they start uncovering a conspiracy that could endanger the entire nation, and they realize the misfortunes brought upon by the Philosopher's Stone.
Steins; Gate: The eccentric mad scientist Okabe, his childhood friend Mayuri, and the otaku hacker Daru have banded together to form the "Future Gadget Research Laboratory," and spend their days in a ramshackle laboratory hanging out and occasionally attempting to invent incredible futuristic gadgets.
Code Geass: On August 10th of the year 2010 the Holy Empire of Britannia began a campaign of conquest, its sights set on Japan.