Determined to get a little recognition, Saitama decides to become a pro hero, but first, he must pass the Hero Association tests and become a full-fledged member.
Several Sea Folk appear and begin attacking citizens. They are easily defeated until The Deep Sea King appears and defeats many heroes including an S-Class.
Garou attacks the S-rank hero Tank top Master, his followers, and Mumen Rider. Garou continues his pursuit of attacking heroes. Saitama buys a wig to join a martial arts tournament after having a brief exchange with Garou.
As the Super Fight tournament heads for its grand finale, the Class S heroes battle to hold back the tide of monster incursions. Meanwhile, Atomic Samurai is setting in motion a plan of his own.