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!

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!

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?!

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!

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!

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…

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!

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!

Saitama is now a certified hero! And with that title comes great responsibility—he’s required to perform one heroic deed per week. While Saitama makes the rounds to meet his quota, an incoming threat from outer space is screeching toward Earth...

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?!

Time bomb Garo, a monster admirer, finally explodes, attacking the Hero Association! Meanwhile, Miss Blizzard visits Saitama at his apartment. Because of his lower rank, she plans to make him one of her subordinates, but…