: "Hoshi Yori Saki ni Mitsukete Ageru" by Hiroko Moriguchi.
The emotional core of the episode focuses on , a C-Class hero with no superpowers. Despite knowing he has no chance of winning, Mumen Rider stands his ground to protect the citizens, delivering a powerful speech about unyielding justice: [S1E9] Fukutsu no seigi
His bravery stalls the monster just long enough for to arrive. Saitama defeats the Deep Sea King with a single punch, though he later intentionally takes the blame for "stealing" the credit to preserve the reputation of the other heroes who fought. Notable Elements : "Hoshi Yori Saki ni Mitsukete Ageru" by Hiroko Moriguchi
"It’s not about winning or losing! It’s about me taking you on right here, right now!" Saitama defeats the Deep Sea King with a
: "The Hero!! ~Ikareru Ken ni Hi wo Tsukero~" by JAM Project.
The episode follows the devastating invasion of J-City by the . After defeating several high-ranking heroes, including Puri-Puri Prisoner and Genos, the Deep Sea King remains an unstoppable threat.
: This episode is widely considered one of the best in the series for its character development of Mumen Rider and its exploration of what it truly means to be a hero.