Falling to a Memory

In a time set way ahead of ours, Raiden, an average citizen of a bustling city, lives with her sister in an old apartment. Without their parents by their side, they are forced to live with each other. This wasn't a problem for Raiden since he loves his sister very dearly. Fate then took a cruel move on Raiden by killing the only family he has left. How will Raiden live with this tragic memory in his head or will fate take on another twist to his life?