The video began…
With a critical hit straight to the soul!!
BANG!!!
Giyu Tomioka's eyes flew wide open as he stared at the screen.
That boy — a face he recognized all too well — clenched his teeth and smashed his forehead directly into a demon's forehead!!
And then—
The demon screamed in agony!!!
What in the world was happening!???
[T-This brat… his head is too hard!!]
The demon — nothing left of him but a head, yet somehow sprouting arms from his hair — rolled his eyes and spoke in utter disbelief.
Then, in the video—
Tanjiro Kamado grabbed the demon by the hair again…
And with a forehead that practically gleamed, slammed it down once more!!
BANG!!!
The impact was so crisp that everyone watching felt their own foreheads ache.
[H-His head!! So hard!!!]
The Hashira all froze in disbelief as they watched the demon—
Eyes rolling back, drool hanging from his mouth—
Collapse unconscious on the spot!
What the—!???
He actually used his forehead to knock out a demon!!!
...
The world of Demon Slayer.
All nine Hashira were stunned speechless.
Never — not once — had they seen a demon knocked out by someone head-butting it.
What kind of skull must this boy have!?
"T-This… this Tanjiro Kamado… is he the Tanjiro you mentioned?"
Every gaze shifted to Giyu Tomioka — the only one among them who had met this iron-headed rookie.
Giyu's mouth twitched violently.
He too was shaken by what he was seeing.
Feeling the stares around him, he covered his face and nodded reluctantly.
"…Yeah."
"This kid… has a very hard head…"
The more Giyu spoke, the more his face heated with embarrassment.
What had he done?
He actually sent someone who fought with his forehead to the former Water Hashira for training!!!
Meanwhile—
The former Water Hashira, Sakonji Urokodaki, sat kneeling on his tatami mat.
Behind his mask, his lips twitched nonstop as he watched the scene unfold.
He knew Tanjiro well — a brave, resilient, hardworking boy.
But even he, as Tanjiro's teacher, had never imagined his disciple would be brave to this degree!!
That was a forehead!!
A human skull!!
Why on earth would you use your head to fight a demon!?
And the craziest part—
He actually knocked the demon out cold!!
There was only one word he could think of…
Absurd.
At that moment, Urokodaki finally understood why the video called Tanjiro the Head-butt Hashira.
Among all Hashira, none had a head harder than his.
When it came to iron-headed stubbornness—
He really could be considered a Hashira-level existence.
"…I just hope Tanjiro survives the Final Selection safely…"
Urokodaki sighed softly and looked back at the video.
...
The world of Detective Conan.
Conan's eyes nearly popped out of his skull.
The cake in his hand slipped and fell onto the floor.
His brain had shut down.
The boy in the video—
Just head-butted a bodiless monster with arms growing out of its hair…
And knocked it out.
"H-Hey hey hey… are modern anime this illogical??"
Edogawa Conan's mouth twitched uncontrollably.
He never expected to witness something this ridiculous.
Beside him, Haibara Ai calmly took a sip of coffee before saying:
"No. Detective-san, you've misunderstood. This shouldn't be an anime."
"Huh??"
Conan stared at her.
"The level of detail is too realistic. When he rammed his head into that monster, you could clearly see the changes in his muscle tension and blood vessels. Animation can't replicate that so accurately."
Haibara's conclusion made Conan scoff.
"So you're telling me this is real?? First—our world doesn't have monsters like that!! And second—look at his clothes! They're clearly from over a hundred years ago. How could it be real!?"
Haibara Ai looked at Conan with absolute serenity.
She was an exceptionally intelligent biologist after all — a huge admirer of Einstein.
So naturally…
She was very familiar with certain theories.
She finally spoke.
"Detective-san… have you ever heard of parallel worlds?"
...
The world of Naruto.
Naruto was dumbstruck.
He watched Tanjiro smash his head again and again into that demon, and his own forehead tingled with phantom pain.
It almost felt…
like he was the one getting hit.
"Hssss~~~"
Naruto grabbed his own head, gasping at the imagined pain.
Behind him, Iruka also held his forehead — both of them contributing warmth to the world.
Meanwhile, in the Hokage's office—
"What exactly is this 'Multiversal Ranking' supposed to be?"
Hiruzen Sarutobi exhaled a long puff of smoke, deep in thought.
Even he couldn't help twitching at the sight of Tanjiro's headbutting.
This kid's head was unbelievably hard.
Hiruzen gave Tanjiro an internal nickname on the spot.
As the video showed Tanjiro repeatedly smashing foreheads with the demon, the Hokage's eye twitched harder and harder.
When the demon finally passed out, Hiruzen fell silent.
...
Back to the video.
Tanjiro stared at the unconscious demon, then collapsed weakly to the ground, exhausted and panting heavily.
He didn't even seem to feel pain in his forehead.
This made countless viewers across the multiverse gasp in disbelief.
"Doesn't his head hurt at all!??"
But Tanjiro looked completely unfazed.
After a short rest, he dragged his tired body onward.
The video slowly faded to black, leaving only Tanjiro's retreating silhouette.
Then a new line of text appeared:
[Boar Chapter]
Everyone across the multiverse lit up with curiosity.
BANG!!!
A wild figure burst into the frame.
[A demon's scent!!!]
It was a shirtless man wearing a boar's head mask — Inosuke Hashibira — charging straight into the scene.
The moment he appeared, everyone instantly understood why this segment was called "Boar Chapter."
His appearance — and his behavior — resembled a crazed wild boar.
Suddenly—
He lunged toward a wooden box on the side of the screen!
His twin blades—
SHING!!!
—were drawn in a flash!!