A-City

A-City (A市 A Shi) was a very large city on Earth. 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 and is currently inhabited by Hero Association heroes and staff.

Before the Monster Association incident, there were 67 heroes living in this city.

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

Hero Association HQ Locations
A-City is home to the headquarters of the Hero Association.

The headquarter has at least 66 floors.

Hero Apartments
Inside the headquarters, there are apartments for heroes in A-Class and S-Class to live in as an option if they wish. All the apartments are within their own section inside.

Hero Apartment 104
This is the room Saitama moved into after his apartment was destroyed and being promoted to A-Class.

Training Rooms
It's unknown how many training rooms the hero association has at their HQ, but it's closed off areas for heroes to train and spar with each other. Saitama vs. Flashy Flash took place in Training Room #3.

Hero Association Prison
This is a high level security prison where the Hero Association keep monsters captured such as Tongue Stretcher, Twin-Headed Tsuchinoko, Beer Bellee, Man-Eating Capybara and the former Monster Association leader Psykos before her escape.

Heroes
Number of Heroes by Class:
 * S-Class: 3
 * A-Class: 7
 * B-Class: 2
 * C-Class: 57

Known Heroes

 * Superalloy Darkshine
 * Tanktop Master
 * Air
 * Butterfly DX
 * Chain'n'toad
 * Crescent Eyebroll
 * Forte
 * Genos
 * Green
 * Lightning Max
 * Saitama

Hero Association Staff

 * Sitch
 * Sekingar
 * Exma

Monsters

 * Vaccine Man (Deceased)
 * Skyfolk (Extinct)
 * Sky King (Deceased)
 * Eagle (Deceased)
 * Falcon (Deceased)
 * Hawk (Deceased)
 * Kite (Deceased)
 * Black Sperm
 * Overgrown Rover
 * Man-Eating Capybara (Deceased)
 * Pot Bellee (Deceased)
 * Tongue Stretcher (Deceased)
 * Twin-Headed Tsuchinoko (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 kills Vaccine Man with a single punch.

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. The Dark Matter Thieves are defeated by 6 S-Class heroes, Iaian, and Saitama.

The Hero Association contracts Metal Knight to clear and rebuild A-City, which he does in a week. He focuses on turning the Hero Association headquarters into a nigh-impregnable citadel and leaves most of the surrounding city 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 up to disaster level Demon.

Parts of the stronghold are destroyed when Tatsumaki and Fubuki clash in the prison area, releasing all the Demon threat level monster prisoners. These damages are further compounded when Saitama intervenes by jettisoning both himself and Tatsumaki out of the building.

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