J-City

J-City (J市 J Shi) is a large seaside city situated on the Earth.

There are at least 15 heroes living in this city.

Evacuation Shelter
The Evacuation Shelter is a public shelter located in J-City, built by the Hero Association for use in the event of an attack by high-level Mysterious Beings. It was used when the Deep Sea King attacked, although it was broken open. Externally, it consists of a giant dome with circular windows lined around the top.

Smelly Lid Prison
Smelly Lid Prison is a high-security prison that holds some of the world's most dangerous criminals. It is located on a small island just off the coast of J-City. The S-Class Hero, Puri-Puri Prisoner, is imprisoned in this facility and regularly breaks out to do hero work.

Junkyard
There is also a Junkyard located on the same island as the prison, which is where the monster TV Junkyard Monster was created.

Heroes
Number of Heroes by Class:
 * S-Class: 1
 * A-Class: 1
 * B-Class: 3
 * C-Class: 11

Known

 * Puri-Puri Prisoner
 * Stinger

Monsters

 * Seafolk (Extinct)
 * Deep Sea King (Deceased)
 * TV Junkyard Monster (Deceased)

Sea Monster Arc
J-City is invaded by the Seafolk. The A-Class hero Stinger is able to fend most of them off until the Sea King arrives. The Sea King rampages through the city, causing chaos and defeating the heroes Lightning Max, Puri-Puri Prisoner, Bunbun Man, All Back-Man, Jet Nice Guy, Sneck, Mumen Rider, and Genos. Before finally being stopped by Saitama.

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