Episode Title:
Unyielding Justice.
Episode Description:
Genos initiates the battle and seemingly overpowers the Deep Sea King until the monster rips off one of his arms. Genos tells the civilians to flee before being further damaged when shielding a child from a glob of acid the Deep Sea King spewed before Mumen Rider appears. Despite his determination and the civilians cheering him on, Mumen Rider is brutally beaten until he is caught by Saitama, who had been instructed by the Association to provide backup and arrives in that exact moment. After exchanging a few words with the Deep Sea King, Saitama defeats him with a single punch, stopping the rain in the process and earning the praise of the civilians. However, when one of the civilians starts badmouthing the other heroes, Saitama downplays his victory to restore the peoples' faith in the other heroes at the cost of his own public image. Some time later he and Genos get fan mail, with Saitama getting only one hate mail but also one thank you letter as well as a notification from the Hero Association that his conduct promoted him to 101st Rank, B-class. While on his way home, Saitama encounters Mumen Rider in a roadside oden shop. Mumen Rider reveals he sent the thank-you letter and pays for Saitama's dinner. In the post-credits, a fortune teller named Madame Shibabawa warns an official from the Hero Association that "the Earth is doomed".
