Garo and Saitama’s clash threatens to destroy the world! The scene of their big battle even spreads to outer space… Then, when Garo unleashes a synergistic technique of the killer moves he’s learned so far, Saitama counters with Serious Mode. At the conclusion of their collision of fists, a shocking event transpires!

Saitama moves into a new residence! Saitama and Genos are searching for household goods at their old place amongst the debris of City Z when they encounter an unusual dog and monkey. Soon after, Saitama’s new home reveals astonishing features…

Nothing about Saitama passes the eyeball test when it comes to superheroes, from his lifeless expression to his bald head to his unimpressive physique. However, this average-looking guy has a not-so-average problem—he just can’t seem to find an opponent strong enough to take on!

After a battle between Terrible Tornado and the Blizzard Bunch, Terrible Tornado pressures her sister Blizzard to sever ties with her subordinates. Saitama tries to intervene, but then a massive brawl erupts between them!

The Monster Association has kidnapped Tareo, the boy who admires Garo, and now Garo finds himself plunging headfirst and alone into the heart of the Monster Association’s hideout. Meanwhile, the Hero Association pushes forward with its operation to rescue Waganma, while Genos and the others are living it up enjoying hot pot at Saitama’s place!

Immediately before the big Monster Association battle, the Class-S heroes hold a strategy meeting. Unfortunately, they just aren’t in sync, and when Amai Mask barges in, the situation only gets worse. Thankfully, King appears just in time to boost their morale—and it’s a good thing, too, because suddenly the big monster battle begins!

Monster Association big shots are taking out S-class heroes one after another… That is, until the strongest man alive, King, rises to confront this crisis. Though the monsters are seething with malice, King appears cool and composed. But can his cool act defuse the dire situation?!

Immediately before the big Monster Association battle, the Class-S heroes hold a strategy meeting. Unfortunately, they just aren’t in sync, and when Amai Mask barges in, the situation only gets worse. Thankfully, King appears just in time to boost their morale—and it’s a good thing, too, because the big monster battle begins!

The hero hunter is near death when the Monster Association attempts to steal him away, unleashing Centichoro in the process. Bang and company face it head-on before Genos boldly enters the fray!

Saitama’s easily taken out a number of monsters, including a crabby creature, a malicious mosquito girl and a muscly meathead. But his humdrum life takes a drastic turn when he meets Genos—a cyborg who wants to uncover the secret behind his strength!

Garo has just left the Monster Association’s hideout when he crosses paths with Saitama, who’s in quite a pickle, but Saitama still doesn't know Garo is the Hero Hunter. Later, King the Ripper can no longer hold back his murderous urges and confronts Garo himself!

For three years, Saitama has defeated countless monsters, but no one knows about him… That’s because he isn’t in the Hero Association’s registry! Together with Genos, Saitama decides to take the Hero Association’s test! But can they pass?!