The Clock Tragedy

In the countdown of Christmas eve, a girl named Kazumi witnessed the harsh tragedy happened in front of her in a snap of a finger. Dead people swarming on their own blood, even her close friends. Until a weird group of black hooded creatures appeared in front of her, chasing after her to get her 'pure blood'. And someone named Rui helped her to change everything before the Christmas eve tragedy would happen again by time travelling.

What's this 'special' thing on her? And where on earth is that creatures comes from?
Can she stop the tragedy that causing the whole humanity ending up their lives miserably? Or just failed just like the beginning?

Let's take a look of the story about the girl who came back to change everything to the near future.