The Greatest Obstacle is the 151st online chapter of One-Punch Man, part of the Monster Association Arc. Atomic Samurai finally draws the telepathic Sun Blade to wound Golden Sperm before exhaustion overtakes him and King steps in.
Main Characters (1)
Summary
Homeless Emperor pours a scorching stream of energy spheres onto Iaian, Spring Mustachio, and Atomic Samurai. The two A-Class heroes are steadily worn down while Atomic Samurai fights to free his new weapon, the Sun Blade. He recalls Nichirin's words that the blade is telepathic and answers only to those it judges worthy. Quieting his mind into a still, reflective calm, he finally earns the sword's response.
With the blade in hand, Atomic Samurai vaults upward and cleaves through Homeless Emperor's enormous sphere. Rattled, Homeless Emperor hurls dozens more orbs, but they cannot touch the Sun Blade. As the swordsman moves to cut down the weakened foe, Golden Sperm throws himself in the way. The blade only skims his hardened body, yet when he tries to snap it, the sword bends impossibly and shears off half his right arm. It then sheathes itself as Atomic Samurai, spent, loses his grip on it. Both monsters register the weapon's danger but quickly grasp that he cannot keep using it. Evil Natural Water resurfaces, startling Iaian, who believed Darkshine had destroyed it. As the pair prepares to counterattack, a rumble sounds behind them.
King appears. Black Sperm, Golden Sperm, Homeless Emperor, and Evil Natural Water all steel themselves against the lone hero. Metal Bat shows up meaning to help but chooses instead to keep any escaping clones contained, while Child Emperor and Puri-Puri Prisoner climb out of the rubble. The heroes relax at King's presence, though inside he is terrified and regrets ever trying to save Genos, aware these monsters are strong enough to face him without fear.
Key Events
Atomic Samurai unlocks the telepathic Sun Blade by clearing his mind, slices through Homeless Emperor's giant sphere, and severs part of Golden Sperm's arm before exhaustion forces the blade to withdraw. Evil Natural Water returns despite being thought defeated. King arrives to confront the assembled monsters while secretly panicking, and Metal Bat, Child Emperor, and Puri-Puri Prisoner regroup nearby.
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Notes
The chapter corresponds partially to Chapter 73 of the webcomic and belongs to the Monster Association Arc, with a large ensemble cover led by Saitama. First posted on October 30, 2021 with 25 pages, it was later revised by Murata and republished alongside Chapter 152 on November 13, 2021.
Frequently Asked Questions
What happens in Chapter 151 (Online), "The Greatest Obstacle," of One-Punch Man?
Atomic Samurai finally draws the telepathic Sun Blade and wounds Golden Sperm, but exhaustion overtakes him before King arrives to confront the assembled monsters.
How does Atomic Samurai finally draw the Sun Blade?
Atomic Samurai quiets his mind into a still, reflective calm, which finally earns a response from the telepathic Sun Blade, a weapon that answers only to those it judges worthy.
What happens when Atomic Samurai strikes Golden Sperm with the Sun Blade?
The blade only skims Golden Sperm's hardened body, but when the monster tries to snap it, the sword bends impossibly and shears off half his right arm before sheathing itself as Atomic Samurai loses his grip.
Why is King's arrival significant in this chapter?
Black Sperm, Golden Sperm, Homeless Emperor, and Evil Natural Water all steel themselves against King, though internally he is terrified and regrets trying to save Genos, since these monsters can face him without fear.
Who resurfaces unexpectedly in this chapter despite being thought defeated?
Evil Natural Water resurfaces in this chapter, startling Iaian, who had believed Superalloy Darkshine destroyed it.
Sources & Information
Looking for more on Chapter 151 (Online): The Greatest Obstacle? The One-Punch Man Wiki on Fandom has a dedicated page with community notes.
View on FandomThis content is original writing by Daddy Jim Headquarters based on the One-Punch Man anime series, manga, and official materials. One-Punch Man was created by ONE and Yusuke Murata, published by Shueisha, and animated by J.C.Staff and Madhouse. All rights to One-Punch Man and its characters belong to their respective owners. Episode and chapter references are cited where applicable.
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All rights belong to their respective owners.
Character and scene imagery on this site is original artwork by Daddy Jim Headquarters, not screenshots or licensed imagery. Official cover art is used on three types of pages for editorial commentary:
- Movie pages: theatrical posters and key visuals, credited to J.C.Staff, Madhouse and Shueisha.
- Game pages: official box art, credited to the game's respective publishers.
- Manga chapter pages: volume covers, credited to Shueisha and ONE and Yusuke Murata.
Official resources:
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