In the Apocalypse of the Book, I Rely on System Elixirs to Stay Alive Every Day

Pei Xingxian was accidentally hit by a high-altitude object while watching a couple arguing upstairs and died. When she opened her eyes again, her hands and feet were tied, and there was a monster with its bloody mouth open to bite her. Also bound to the system. What! Traveled into a post-apocalyptic novel? What! The system has lost part of its energy and cannot support her normal health. She needs to kill zombies to earn health by herself? See how you, sister Xianer, and I work hard to survive!