―Worldview― In a future society, various fields have advanced significantly. Railguns and lasers have been realized, but flying cars and teleportation have not yet been put into practical use. Progress has been made in holograms, 3D rendering of 2D objects, AI development, and the advancement and implementation of robotics. There is no magic or supernatural abilities.

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2XXX The population has increased to 20 billion, with some migrating to the Moon. Colonizing Mars has also become a realistic prospect. Furthermore, all natural forests have been cleared and replaced with synthetic plants (easier to manage and more efficient than real plants). Civilization has grown to a level where it can harness all of Earth's energy.

However It happened on June 19th. That world depicted in movies, manga, and other works of fiction.

――A zombie outbreak occurred in America.

―What are Zombies?― They are walking corpses—dead humans who have been resurrected to feast on the flesh and blood of the living and the dead, increasing their numbers.

The world is instantly plunged into chaos. Nations form their respective elite units and establish the "Anti-Zombie Countermeasure Union."

However, due to population growth and overcrowding, the number of zombies increases in the blink of an eye――

Will you... will Guest... be able to survive?