The Holy Grail War is a battle between seven magicians who each summon a mythical hero to fight for their cause. Shirou, a twice orphaned high school boy, had so little magical talent that his foster father did not bother teaching him about the war and its meaning. Thanks to that lack of foresight, Shirou finds himself in a bit of a pinch when he accidentally summons a hero of the strongest class, and is sucked into the fray. The Grail grants the winner any wish they have. But driven by an unyielding sense of justice and self-sacrifice, for what will Shirou fight?
Beyond the knowledge of most people, the world contains a dark secret: of every person in the world, there exist two identical copies (called Doppeliners) with the same body and mind. Among the three, however, is distributed only a finite amount of fortune; should they ever encounter one another, the one with a smaller portion dies and the remainder is distributed until only one, the Master Root, survives. Keita Ibuki lives his day-to-day life as ignorant of this as everyone else until he stumbles upon a mysterious young girl named Kuro who explains to him these secrets of the world. Despite not wanting to have anything to do with her or the danger that inevitably seems to follow, their fates become intertwined and he finds that the Doppeliner system has more to do with his past than he realizes.
Both of these have the Master/Servant feel to them. Although the battling system is quite different, both have an ideal of a peaceful world.
The voice actor for Kuro in Kurokami is the same as Sakura Matou in Fate Stay Night. If you like Sakura (as in heavens feel Sakura, not really covered in the anime) then you will probably like Kuro as well.