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A-City (A市 A Shi) was a very large city in the world of One-Punch Man. After being completely destroyed by the Dark Matter Thieves, the area was rebuilt by Metal Knight into an expansive complex with highways leading to the other cities. It now serves as the location of the new Hero Association headquarters[1] and is currently inhabited by Hero Association heroes and staff.[2]

There are 67 heroes living in this city.[3]

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 HQ



Number of Heroes by Class:[4]

  • S-Class: 3
  • A-Class: 7
  • B-Class: 2
  • C-Class: 57


Hero Association Staff



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 kills Vaccine Man with a single punch.

Hero Association Saga

Rumored Monster Arc

The council of the Hero Association calls up the heroes to check the status of their cities.

Alien Conquerors Arc

Boros and the Dark Matter Thieves attack A-City. They bombard the city, demolishing 99.8% of it in an instant.[5]. The Dark Matter Thieves are defeated by 6 S-Class heroes, Iaian, and Saitama. Metal Knight is 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 nigh-impregnable citadel and left most of the surrounding city a wasteland.

Psychic Sisters Arc

Webcomic notice This article contains webcomic spoilers. You have been warned, manga-only readers.

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.[6]



  1. One-Punch Man Manga; Chapter 20
  2. One-Punch Man Manga; Chapter 36, page 27
  3. One-Punch Man Anime; Episode 14
  4. One-Punch Man Anime; Episode 14
  5. One-Punch Man Manga; Chapter 32, page 13
  6. Webcomic Chapter 100


Cities A-CityB-CityC-CityD-CityE-CityF-CityG-CityH-CityI-CityJ-CityK-CityL-CityM-CityN-CityO-CityP-CityQ-CityR-CityS-CityT-CityU-CityV-CityW-CityX-CityY-CityZ-City
Locations Bang's DojoCafe & Restaurant TogusFinal Training GroundHero Association HospitalHouse of Takoyaki 🐙King's ApartmentMonster Association HeadquartersMoonMouse SushiNinja VillageSaitama's ApartmentSmelly Lid PrisonZ Police StationZ-City Ghost Town
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