Speed-o'-Sound Sonic and Flashy Flash vs. Heavenly Ninja Party is a battle where Speed-o'-Sound Sonic and Flashy Flash join forces to take on the Heavenly Ninja Party.
Prelude[]

The Tenninto assembled.
The Heavenly Ninja Party interrupts the duel between Speed-o'-Sound Sonic and Flashy Flash, frustrated that Sonic did not lure Flash to the designated location. When Sonic recovers from Flash's Flash Kicks and attacks Shrieking Scream, the group brands him a traitor and decides to eliminate both him and Flash.
Battle[]
Brawny Muscle dashes behind Gale Wind and Hellfire Flame, delivering a powerful punch that sends them hurtling toward Sonic and Flash, intending to use them as shields. As they close in, Wind quickly pulls out his razor wire, wrapping it around himself and Flame to slice apart anyone who dares approach. However, Flash quickly counters using Wind's own wire to tie both of them up.
Violent Force, Balanced Equilibrium, and Empyrean Sky launch their respective attacks: Force unleashes a barrage of punches at Flash, Equilibrium attempts to impale him with his crescent moon spear, and Sky swings dual swords at Sonic. All miss as Flash sidesteps while Sonic leaps over the attack. Flash retaliates by kicking Equilibrium and Force away, while Sonic kicks Sky back. Sonic then asks Flash why Wind and Flame are spared, to which Flash responds that they might be useful for researching a way to reverse monsterification.

Muscle breaking Flash's weapon
As Sonic and Flash continue fending off the remaining members, Muscle charges at Flash and executes a technique called Shattering Fist, delivering a punch that shatters Flash's sword. Frustrated, Flash discards the broken weapon, lamenting how it was a poor substitute for "Instakill" (his original sword). Sonic then charges, ordering Flash to move aside.

Sonic using Serious Side Hops inspired by Saitama.
Drawing inspiration from Saitama's Serious Side Hops, Sonic generates over 30 afterimages while dashing past the foes, aiming to knock out multiple members with the shockwaves like how Saitama had once done to him. However, unlike Saitama, Sonic's technique lacks the necessary force, rendering the shockwaves ineffective. Muscle pinpoints the real Sonic among the afterimages, landing a clean punch to his face and knocking him back, mocking his failed attempt. Despite this, Sonic managed to snatch one of Sky's swords and tosses it to Flash for him to use as a weapon.
The ninja group continues its onslaught. Ballistic Bullet opens fire on Flash with dual pistols, taunting that he will die without ever understanding their plan or knowing true freedom. While fending off other members and blocking the gunfire with his sword, Flash ridicules the notion, calling it the ideology of a loser who failed to carve out his own place in the world and instead chose to remain a slave to the "Village". Meanwhile, Instant Moment and Force attack Sonic simultaneously. Force lands a solid punch to Sonic's face, knocking him backward, while Moment seemingly misses with his spear. As Sonic is knocked backward, he lands on a tree trunk and uses it as a launchpad to launch himself at Moment, breaking his weapon with a kick. He notes to himself that their attacks pale in comparison to Saitama's punches, which is why they hardly faze him. Flash, recognizing how much his own skills have sharpened, considers the group's attacks nothing more than child's play. He recalls Sonic once speaking about "the power to live life as one pleases" during their childhood and wonders where it is now. While dodging multiple kunai by jumping back, he questions whether Sonic's ideals were merely a fantasy. Flash notes that the Heavenly Ninja Party will never understand true freedom, as they remain shackled by their upbringing.
Leaping back near Sonic, Flash and Sonic charge forward while the ninja group does the same, preparing for another clash. Before either side can engage, Blast suddenly flash-steps between them, stopping the blade of Illusory Phantom's weapon with his right hand while catching Flash's sword-wielding hand with his left. Blast declares that the fighting should end, as there is no need for further pointless bloodshed. The Heavenly Ninja Party erupts in shouts, demanding his identity, and Flash exclaims, "Blast!" This stuns everyone present. Recognizing him as their target for elimination, the ninja group remarks on the convenience of his arrival before charging at him with full force. Without moving from his spot, Blast opens multiple portals around himself, redirecting his punches through the portals. In an instant, his attacks strike from unexpected angles, landing primarily on their faces and heads, swiftly taking them down.
Aftermath[]

That Man defeated by Saitama off-screen.
Sonic laments that just as he was about to finish off the Heavenly Ninja Party himself, Blast had to interfere. Flash asks why Blast is here, to which he gestures toward Overgrown Rover standing nearby, explaining that the dog's nose led him to them. Defeated, the ninja group reveals that That Man has undergone further physical enhancement procedures since losing to Blast fifteen years ago. They warn that he must be waiting at Sonic's hideout, claiming it would have been better for Sonic and Flash to die by their hands. Blast then teleports everyone to the hideout. There, a figure-shaped crater is seen in the ground while Saitama casually sits nearby. Everyone is surprised. Blast explains that although he arrived earlier, Saitama had already come before him and taken down That Man off-screen. The Heavenly Ninja Party bursts out laughing, refusing to believe the story, and charges Saitama. He knocks them all out, seemingly with a single punch each. Sonic asks about Saitama's presence at the place. In response, Saitama smacks him with a letter, saying it is because Sonic kept sending him such letters inviting him to his place.

Two interdimensional Mysterious Beings emerging.
Suddenly, a crack opens in the sky, resembling a dimensional tear. This happens because Blast has wandered too far from his station. Byakko and Genbu, two divine beast guardians serving "God", burst through. They immediately cause destruction, leveling nearby city blocks. However, Void, now freed from "God's" influence and returned to being human due to Saitama's earlier knockout, and Blast put an end to this by overpowering the two divine beasts before Blast sends them back to another dimension where they came from.
Trivia[]
- In the webcomic, the fight differs from the manga in several ways. In the prelude, Sonic attacks Instant Moment instead of Shrieking Scream. Muscle breaks Sonic's sword instead of Flash's, and some members of the Heavenly Ninja Party wield different weapons. Wind and Flame are not treated as weaklings by the group. Additionally, rather than Blast interrupting, Sonic and Flash finish off and kill the ninja group themselves.
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Ninjas Arc | |
---|---|
Manga Chapters | 193 • 194 • 195 • 196 • 197 • 198 • 199 • 200 • 201 • 202 • 203 |
Webcomic Chapters | 112 • 113 • 114 • 115 • 116 • 117 • 118 |
Fights | Saitama vs. Flashy Flash • Speed-o'-Sound Sonic vs. Flashy Flash • Speed-o'-Sound Sonic and Flashy Flash vs. Heavenly Ninja Party • Speed-o'-Sound Sonic and Flashy Flash vs. Empty Void |