When I started watching, I had no clue at all on what the anime was about. Fortunately, the first episode went along smoothly answering basic questions.
The songs were a beautiful addition, fitting very nice with the story and the flow.
The story is about the Holy Grail, said to be an omnipotent wish- granting device. There are seven sides to the story, seven partnered Masters and Servants. The pace was perfect like a story unfolding in front of your eyes or a book with its every content shown at the most colorful and meaningful interpretation.
It is an anime with a lot of touches, action and sadness driven with the power of desires and belief, hopes and twisted wishes that came from different pasts and the ever-uncertain future.
I highly recommend it to people who want action, an interesting plot and some grief to accept.