Rumored Monster Arc

The Rumored Monster Arc is the fifth arc of the One-Punch Man series, and the second arc of the Hero Association Saga.

Plot
The Hero Association staff are having a meeting, discussing reports from various cities. The association sends Spring Mustachio and Golden Ball to investigate rumors about the abandoned section of Z-City. They encounter Kombu Infinity, who defeats them. The monster informs them that it isn't the rumored monster, but seeks to become the monster for fun. It encounters Saitama, who steals its kombu hair to make soup. Genos believes Saitama is trying to regrow his hair with the kombu, but Saitama firmly denies it.

Story Impact

 * The existence of the Monster Association is hinted at for the first time.
 * It is revealed that the Hero Association leaves certain heroes in-charge of certain cities.
 * Sneck is in-charge of F-City, Mushroom and Horse-Bone are in-charge of H-City, Lightning Genji is in-charge of D-City, Heavy Kong is in-charge of W-City and Watchdog Man is in-charge of Q-City.
 * Genji mentions that B-City and D-City are still being repaired after Marugori's attack.
 * Sneck is spying on Hammerhead, who is looking for a job.

Major Battles

 * Kombu Infinity vs. Golden Ball and Spring Mustachio
 * Kombu Infinity vs. Saitama

Trivia

 * The Rumored Monster Arc is the first original Manga story arc.