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Z-City (Z市, Zeddo Shi) is a large city on Earth. It consists of a business district, a residential district, and an abandoned, trashed area commonly referred to as the Ghost Town. Saitama and Genos are inhabitants of the latter area, which is home to many Mysterious Beings but is free to live in. It is rumored to contain incredibly powerful Mysterious Beings.
Z-City has had the greatest percentage increase of monster appearances in the past decade.