Survival Game: There Is a Murderer Standing at the Door at the Beginning

Qing Huan went to the United States to study and encountered a gunfight and was accidentally injured by a stray bullet. She traveled through and obtained the system. Before she could be happy, the system told her that there was a perverted murderer standing outside the door. And her mission is to survive. The first world: the world of detective novels The second world: the blood plague wasteland world The third world: high temperature furnace world The fourth world: Witch Royale world [Growing heroine + infinite rebirth + survival game + natural and man-made disasters + counterattack]