Crimson Sphere

When Cher Williams wakes up with a strange mark on her hand, her life as a regular high-school girl is turned around as she suddenly finds herself a participant in what is known as the "Sinner's Game", where she must fight for her life and kill the other Players to survive. Armed with weapons possessing mysterious powers, only the last Player standing earns the right to live. Can Cher find the resolve to pull the trigger and kill another human being?