Z-City

Z-City (Z市, Z Shi) is a large city within the world of One-Punch Man. 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. It is the most populated place for Mysterious Beings to be rumored around the area in Z-City.

Shelter Nr. 7
Shelter Nr. 7 is a public shelter located in Z-City, built by the Hero Association in the event of an attack by Mysterious Beings. Externally, it consists of a giant dome lined with circular vents, which is able to withstand anything from extreme temperatures to missile attacks.

Shelter Nr. 7 very much resembles a sporting venue, with at least seven different entrances meant to accommodate large crowds. It was designed specifically to repel Mysterious Beings, and features biometric authenticators at each entrance to detect any possibly masquerading as human; once the shelter's defense system is active, all entrances are sealed and locked.

The interior of the shelter is largely open space, with rafters overhead installed with sprinklers and speakers to spray negative ions and play classical music, respectively—both meant to calm its likely-panicking evacuees.

However, Shelter Nr. 7 does not feature any restrooms, a rather glaring oversight given its enormous capacity.

Bang's Dojo
An area where Bang trains his disciples, but one, Garou, beats some of the disciples, and leaves the rest too scared to go back, and quit. The only remaining disciple is someone named Charanko.

Matsuri
Summer Festivals are held here.

Uninhabited Zone
An area in Z-City where there are rumors about massive activity of mysterious beings in the zone, causing fear to civilians to leave the area and close it off from the public. However it is also where Saitama and Genos live, as the mysterious beings pose no challenge to their tremendous strengths.

Heroes

 * Saitama
 * Genos
 * Mumen Rider
 * Bang

Monsters

 * Crablante (Deceased)
 * Subterranean People
 * Subterranean King (Deceased)
 * Kombu Infinity
 * Personification Of A Light Pull Cord (Deceased)
 * Super Custom YO649Z Mk. II (Deceased)
 * Hotdog (Deceased)
 * Fish of Darkness

Saitama Introduction Arc
The Underground King leads his forces to invade the overworld, but is killed soon after surfacing.

House of Evolution Arc
Z-City is first mentioned by name when there is a mosquito outbreak caused by Mosquito Girl. Genos ends up fighting Mosquito Girl, but is ultimately defeated after Mosquito Girl transforms. Mosquito Girl is then defeated by Saitama.

Rumored Monster Arc
The Hero Association begins an investigation of Z-City especially the uninhabited parts and sends Golden Ball and Spring Mustachio to investigate. They do not find the rumored monster, but instead find Kombu Infinity. The A-Classes heroes are defeated, but not before they call back up. Saitama, coming home from a shopping trip, beats up Kombu Infinity and steals its hair for use in his soup.

Giant Meteor Arc
A Giant Meteor is heading straight towards Z-City and Genos and Bang are assigned to take care of it but fail. The meteor is destroyed by Saitama but causes mass collateral damage.

Super Fight Arc
Gouketsu was on his way to destroy Z-City, but is killed by Saitama on the way.

Monster Association Arc
Gyoro Gyoro delivers a message to the Associations members and Orochi kills Awakened Cockroach.

The S-Class heroes, Sweet Mask, Atomic Samurai's disciples, Bomb and Fubuki preform a raid on the monster association HQ with the assistance of Saitama who wanders in by accident. After the battle most of Z-city is destroyed including Saitama's house.

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Z市 Z-City