Z-City

Z-City (Z市, Z Shi) is a large city located in Japan. It consists of a business district; a residential district and an abandoned, trashed and deserted area. Saitama and Genos are inhabitants of the latter area, which is home to many Mysterious Beings but has cheap rent. Along with several other superheroes, they defend the city from the many monster spawning in it.

Superheroes

 * Saitama
 * Genos

Monsters

 * Underground People
 * Underground King
 * Kombu Infinity