A-City

A-City (A市 A Shi) was a large city within the world of One-Punch Man which was completely destroyed by the Dark Matter Thieves's attack. Metal Knight re-built the area into an expansive complex with highways leading to all other cities, which now serves as the location for the new Hero Association headquarters. It is now only inhabited by Hero Association staff and heroes.

'''The following section contains Webcomic spoilers. You have been warned, manga-only readers.'''

It was later opened as a private residential complex for the rich, complete with pools, restaurants, cafes, and even an underground mall.

Hero Association Staff

 * Sitch
 * Sekingar
 * Executive Girl

Monsters

 * Skyfolk
 * Sky King (Deceased)

Saitama Introduction Arc
The monster Vaccine Man attacks the city. Lightning Max and Smile Man are sent to defeat him but are defeated. Later Saitama shows up and defeats Vaccine Man with a single punch.

Rumored Monster Arc
The council of the Hero Association call up the heroes to check in on their cities and to see if everything is alright.

Alien Conquerors Arc
Boros and his Dark Matter Thieves attack the city in order to find the worthy opponent of a prophesy that Boros found. Over 99.8% of A City is destroyed in the process. The Dark Matter Thieves were defeated by 6 S-Class heroes, Iaian and Saitama. Metal Knight was contracted by the Hero Association to clear and rebuild A-City, which he did in a week. He focused on turning the Hero Association headquarters into a near-impregnable citadel and left most of the surrounding city as a wasteland.

Psychic Sisters Arc
Having been remade into a fortress by Metal Knight, some of the A-Class and S-Class move there, including Saitama. Since there is still a lot of vacant property within the citadel, some of it is turned into a private residential complex for the rich looking to stay safe, complete with pools, restaurants, cafes, and even an underground mall. It also has the latest anti-earthquake technology installed.

Part of the complex is used by the Hero Association as a prison for Mysterious Beings of upto disaster level Demon.

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