One unemployed man was fortunate to get a job as a janitor in an underground warehouse.But one day, while cleaning the warehouse, he found a secret door that led down to a deeper mysterious research facility.While investigating a mysterious research facility He was knocked out by a researcher who injected an experimental drug into his neck from behind. After that he lost consciousness. He regained consciousness and found himself trapped in an underground research facility. He tried to find a way out, but all the doors were locked. There is only a small air vent that can be an exit to the outside. but he was too big

When he thinks he's too big to enter the vent His body was getting smaller and smaller. Until enough to pass through the vent. Causing him to discover that at that time he had a special power that could change the size of his body as he wished.

After coming out to the outside world, he found that the entire city was infested with zombies. Almost all the people fled the city. He then sought a way out and discovered that The starting point for the zombies came from the research facility he found underground. It was one of the bodies the researchers left behind that they thought were dead. But turned into a powerful prototype zombie. spreading the virus to the whole city

and he also discovered that Medicine injected into his body It will gradually turn him into a zombie. The only way to survive was to take the original zombie blood and inject him into his body as an antidote. The blood that is left in the heart of the original zombie. He had to find a way to kill the prototype zombies.
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