G-City

G-City (G市, G Shi) is a large city within the world of One-Punch Man.

Civilians

 * Shibabawa

Sea Monster Arc
The city first appeared while Shibabawa was predicting the future for the next half year, she foresees that the greatest catastrophe of the era is about to strike and that the Earth is in danger.

Monster Association Arc
Kamikaze attends a meeting of the Council of Swordmasters in G-City. At the meeting Atomic Samurai asks the council members for help in catching and killing Garou in worries that Bang might fail and die. The council members agree, except Haragiri who mocks Atomic Samurai's plea. Haragiri proceeds to show them the Monster Cells and reveals he had received them from the Monster Association and transforms into a Mysterious Being himself. Haragiri then orders the other to eat the cells or he will kill them, but Atomic Samurai cuts him first, killing him.