Jiang Ning created a portable space three days before the end of the world. One cubic meter can only hold dead objects. She stuffed it with rice, water, medicine, and a claw hammer.
Three days later the zombies came. She killed the first zombie, cut out the crystal core, and space "ate" it - and then it grew a little bigger. Kill zombies, get crystal cores, and expand space. She survived with this invisible warehouse, rescued a group of people, and became the "granary" for everyone.
But she discovered that the crystal core was the "soul residue" left after the virus devoured human consciousness. The more memories it absorbed, the more confused it became. She also discovers that her blood is the antidote - it can save people, but it can also attract everyone to covet her. Crazy scientist Chen Chongming broadcasts her coordinates to the whole city, while he tries to access the underground crystal core array and become a "god".
At the last moment, she chose to format all the crystal nuclei and let the zombies around the world disintegrate, at the cost of all awakened ones losing their abilities. The heartbeat stopped, the crystal core shattered, and then he was rescued.
The world is at zero. No more powers. She threw the last broken crystal core into the wind.
The biggest space is not the warehouse, but the human heart.