Archer, a man who fought through entire wars, fighting by himself carrying out an ideal that he did not wish for, and yet had nothing else to live by.
The two sisters Rin and Sakura who in the future have bitter hardships to overcome. But here they're still young kids pure and innocent.
What makes this so awesome? It's Archer finding a meaning for his fighting from Rin and Sakura. Here he truly wants to protect people out of his own wishes not one handed down from someone else. And in finding meaning for his ideals, he also finds the peace that he missed in his time as a human.