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The Ninjas Arc is the nineteenth arc of the series, and the fourth arc of the Neo Heroes Saga.

Plot[]

Flashy Flash, determined to make Saitama his disciple to help him unleash his full potential, visits Saitama's apartment where Saitama is playing video games with King. After a brief scuffle with Genos and multiple rebuffs from Saitama, Flash's persistence is finally rewarded when he convinces Saitama to have a training bout at one of Flash's training sites. If Flash defeats him, Saitama will become his disciple, but if Saitama can land even one hit in thirty minutes, Flash will have to leave him alone. As their match goes on, Flash is shocked by Saitama's ability to keep up so casually. Saitama easily breaks Flash's sword and is about to land a punch on the cornered ninja, but Genos interrupts the match before there can be a conclusion, telling them several Demon-level Mysterious Beings have appeared nearby and that they should go help stop them.

Meanwhile, Heavy Kong, Bone, and Peach Terry are struggling to defeat the Internet Surfers. As they fight, the Internet Surfers notice Speed-o'-Sound Sonic watching nearby. Saitama, Genos, and Flashy Flash then arrive on the scene. Sonic is surprised to see Saitama hanging out with Flash, and a stand-off between the heroes, the monsters, and Sonic occurs. In a flash of speed, the Internet Surfers have been defeated and Saitama has buried Sonic in the concrete.

Later, Saitama asks Flashy Flash about his and Sonic's relationship, so Flash tells him their backstory. He explains the existence of the Ninja Village and the inhumane things that he, Sonic, and the rest of their classmates had to endure in the brutal and oppressive training there. Once Flash became strong enough, he decided to destroy the hellish place by murdering all of the staff and his fellow classmates in a bloody massacre, and poisoning Sonic so as to not have to kill him directly. However, Sonic evidently managed to survive.

Elsewhere, Sonic is resting in his hideout and easing his injuries when he is suddenly approached by Gale Wind and Hellfire Flame, alongside a bevy of other ninja graduates from the Ninja Village calling themselves the Heavenly Ninja Party. They explain that the leader of the Ninja Village has finally awoken after being put into a coma fifteen years ago by a battle with Blast, and it is now time to get revenge on both Blast and Flashy Flash. They then forcibly enlist Sonic to help them find Flashy Flash.

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Story Impact[]

  • Multiverse exists in One-Punch Man, based on the MWI of quantum mechanics. This is proven when Empty Void, in the hyperspace, demonstrates awareness of parallel worlds that branch out infinitely with every possibility. This suggests that the number of parallel universes and alternate realities can be considered "effectively infinite" in terms of human comprehension and scale.

Site Navigation[]

Story Arcs
Introduction Saga Saitama Introduction ArcHouse of Evolution ArcParadise Group Arc
Hero Association Saga
Human Monster Saga Garou Introduction ArcThe Blizzard Group ArcHero Hunt ArcMonster Raid ArcSuper Fight ArcMonster Association Arc
Neo Heroes Saga
Ninjas Arc
Manga Chapters 193194195196197198199200201202203
Webcomic Chapters 112 • 113 • 114 • 115 • 116 • 117 • 118
Fights Saitama vs. Flashy FlashSpeed-o'-Sound Sonic vs. Flashy FlashSpeed-o'-Sound Sonic and Flashy Flash vs. Heavenly Ninja PartySpeed-o'-Sound Sonic and Flashy Flash vs. Empty Void
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