Koichi Haimawari & Pro Heroes vs. Number 6

The Crawler & Pro Heroes vs. Number 6 is the final battle of Operation Anonymous between the Vigilante The Crawler and numerous Pro Heroes against the Villain Number 6.

Prologue
As the seemingly never ending battle between Koichi and Number 6 continues, Koichi starts to notice that many of the civilians in Naruhata, including his friends, have now started to emerge from hiding, rooting for him to fight. He tries to tell them to leave but they are unable to listen. Eventually, the Narufest and Hopper's Cafe crews take charge of the evacuation of the citizens, while Koichi attempts to recover.

While a reporter from above tries to inform the civilians of the danger, Number 6 swipes at it, causing the people within to fall out of it. Koichi tries to jump to save them, but realizes he's unable to reach them in time. Just then, they are saved as the fibers in their clothes attach itself to a nearby building to prevent their fall. Best Jeanist emerges, declaring to everyone that even in the daunting crisis, their thread of hope remains in tact, and this city still has its Heroes.

Battle
While Best Jeanist reassures the civilians of aid being on the way, Edgeshot uses his Quirk to glide himself above the city, reporting on Number 6's movements, while Ingenium and Team Idaten assist the Narufest and Hopper's Cafe crews in evacuating everyone. Still in the air, Koichi looks on relieved that the Heroes have finally arrived, when he's suddenly ensnared by Eraser Head's Capturing Weapon, pulled back down onto the streets.

Eraser Head uses the cloth to brace up some of Koichu's fractured limbs, confronting him over proving him right that he'd end up breaking his bones if he kept meddling like this. He continues to tell the Vigilante that he knows Number 6 is after him, so they have to use him as bait for now, but he'll be there to back him up, giving chase through the alley as the giant flaming monster once again tracks them down. When he mentions that nobody has a good Quirk to take him down currently, Koichi asks about his Erasure, which he responds that enemies that glow bright prevent proper visual confirmation, so it won't work, so they just have to wait until backup arrives.

Number 6 goes in for a punch at Koichi, who is pulled away by Eraser Head's Capturing Weapon back up onto the rooftop. Eraser Head runs along while the tied up Koichi shoots several repulsion blasts at Number 6. As the battle escalates, Eraser Head notices all the civilians of Naruhata watching on, recognizing "The Cruller" fighting the giant villain, and cheering him on to succeed and defeat it. Eraser Head comments on Koichi's "popularity", and how it's not only making the citizens evacuate slower, but also riling Number 6 up.

Sure enough, Number 6's inner child envisions all the kids on the playground return to play with Koichi, leaving him all alone. Halting his rampage, Number 6 thinks about how his dream, and everything that he has ever wanted to become, is now all happening for Koichi.

Number 6 proceeds to scream out in despair, his power overloading his brain to the point that he completely explodes his combustive body. Emerging from the explosion is a hoard of numerous "mini bombers" that begin to split apart from each other and begin to suicide bomb all throughout the city. The backup of Present Mic, Mister Blaster, and his Buster Union, arrive unsure of what they can do to prevent the widespread damage by the mini bombers.

Just then, they receive word from an incoming visitor, reminding them that since their specialty is concentrated firepower on a single villain, they are out of their wheelhouse. Endeavor descends on the city from a plane above, declaring it's time for him to take charge.

With the chaos escalating due to the mini bombers, Team Idaten, Hopper's Cafe, and Narufest crews attempt to speed up the evacuation of the civilians, having secured an evacuation route. One mini bomber goes directly for two citizens, but Edgeshot uses his Substitution Jutsu to absorb the attack and save them. Elsewhere, a building from an explosion begins to crumble, so Best Jeanist uses his Quirk to manipulate the threads on his outfit to tighten the building and save the civilians below, at the cost of him being nearly naked.

Koichi and Eraser Head remain on standby on the side of a building, with the former noting that based on the way the bombers are moving, they don't seem to have a mind of their own, just haphazardly zipping around. He looks around for the main body, while Eraser Head notices something going in the rubble down below, and jumps in to investigate.

In the sky, Burnin warns Endeavor that it's still a mess in the city so they can't do anything yet, but Endeavor states they can't sit back while the destruction continues and he'll take full responsibility for whatever happens, preparing to roast all the villains while minimizing the damage. Then suddenly, a flash appears in the sky, which everyone in the city recognizes.

In the blink of an eye, All Might, who had seen the news broadcast from his Might Tower, blasts his way down into Naruhata right past Endeavor, declaring that he is here. In an instant, right after landing into the city, All Might upper cut smashes every last one of the mini bombers into the air, at a speed so fast it appears as if there's multiple of him. With the mini bombers all in the air safely, Endeavor laments how brazen he is and that he'll get no thanks from him, unleashing his Flashfire Fist: Prominence Burn attack, completely decimating every one the bombers as everyone looks on from below, and All Might speeds off satisfied.

Aftermath
With the threat over, Present Mic informs all the civilians that All Might has dealt with all the Villains and since the power will be back on later, everyone should head back home, and to call out for a hero if they need help. At the same time, the Pro Heroes, Team Idaten, Narufest, and Hopper's Cafe crews continue their assistance with the evacuation, and Eraser Head helps a child free from the rubble of a nearby building, telling their family to get to safety.

Meanwhile in an alleyway, All For One confronts the skeletal remains of Number 6, noting that another crisis has been averted by All Might's meddling. However, he still commends Number 6's creativity, and how even he was able to outmaneuver All Might at the last minute. He states that now no one can stop him, and the world is his oyster, as Number 6's body slowly starts to be regrown.

Using his Overclock to speed himself up and keep him out-of-sight, Number 6 makes his way through the crowd of civilians, all the while All For One reflects on his current burnt up display, stating that without enough Bomber cells, his combustion ended before completion, but still should be capable of achieving his final goal. He reminds Number 6 that his specialty lies with "Operation Anonymous", and with the Heroes believing to have defeated the threat, he is once again the "invisible man" and able to finish The Crawler with no one the wiser.

They manage to locate Koichi on a nearby rooftop, with All For One telling him to do one quick strike to kill him, also telling him to collect his body for him to study. However, Number 6 instead brushes All For One's visage away, transforming into his "Rokuro Nomura" face, and calling out to the vigilante. Koichi reacts with a relieved look, saying that after how beat up they both got they should go to the hospital, but Number 6 says its too late, as he's got absolutely no body left, and that it's only his Quirk holding his form together.

Number 6 states that he's already dead and no one can save him, so Koichi's "nice guy" act is pointless, but Koichi simply responds he doesn't know much about finding meaning in stuff so they should just go anyway. Exasperated, Number 6 says at the end of the day, they aren't the same; all he wants is meaning and proof he existed, leaving a mark on the world before he goes. He quickly goes to attack Koichi, slicing him on the cheek, before backing away laughing at how he's left a mark that'll leave a sick scar. He exclaims that every time he sees the scar, he'll remember the weight of responsibility, the meaning of existence, and the one guy he failed to save no matter how hard he tried.

As Number 6 unleashes one final explosion, his brain slowly being obliterated, he tries to draw on his past memories, only for there to be nothing worth remembering, no past or future. However, he then begins to hear a song: Pop☆Star's song. He's confused why he's remembering that, since his "Rokuro Nomura" persona was seemingly a sham just modelled after Koichi, but even still, he remembered it being really nice, and even started crying when he first heard it.

With Number 6's remains being burnt away, Koichi is caught up in the explosion and is knocked unconscious, where he is found shortly afterwards by Eraser Head.