The Difference Between Kendo and Sword Arts

The moment the stream went live, viewers poured in by the thousands.

Whether it was the advance schedule announcement or sheer anticipation, the chat filled before anyone could blink.

I flicked my gaze toward the television mounted on the far wall of the kendo gym.

Thanks to the feed I'd synced in advance, I could see everything with perfect clarity — Namgung Yeon and myself on camera, and every line of chat scrolling underneath.

"At this rate, there's no point waiting for a bigger crowd."

A week ago, the first time I'd gone live, I'd stalled the actual content just sitting there waiting for people to show up.

No matter how entertaining the material, it was meaningless if nobody was watching.

But now thousands of viewers had taken their seats in the span of a heartbeat. There was nothing left to wait for.

"Alright. People are here, so let's skip the preamble and get to it."

I clapped my hands once, sharp enough to pull every eye toward me. Then I drew the sword from my waist and held my beloved blade out for the viewers to see.

"In your minds — what is a sword?"

The question landed lightly, the way you toss out small talk. There was no single correct answer, and the chat obliged with a scatter of replies.

It's just a weapon. The king of all arms. A blade that cuts and stabs. The first thing you picture when someone says melee weapon.

I scanned the answers and felt the corner of my mouth curl. Every last one of them was a perfectly valid description of a sword.

"You're all correct. Then let me ask you this — what's the difference between kendo and sword arts?"

Another question. This time, the chat went noticeably quiet.

"Kendo is a martial way that uses the sword. Sword arts are martial techniques that use the sword."

But were the two swords the same? And if they weren't, where exactly did a martial way and a martial art diverge?

It wasn't a question you could answer easily — which was precisely why I'd asked it.

"The difference is simpler than you'd think. Mental Image. In other words — your state of mind."

In the modern era, nearly every martial art has come to place considerable emphasis on mental discipline. So the viewers, unsurprisingly, questioned my claim that Mental Image was what set kendo and sword arts apart.

They questioned it. I continued anyway.

"I'm not saying kendo ignores the mental side entirely. It pursues Unity of Mind, Sword, and Body, and it trains virtues like focus, decisiveness, perseverance, and restraint. Sparring is also used to instill mutual courtesy."

It's not as though I look down on modern martial arts, or deny their value. In the process of creating and cultivating my own martial arts, I'd researched, analyzed, and trained in any number of them.

"But that isn't Mental Image. Every form of mental training in kendo ultimately feeds into Unity of Mind, Sword, and Body — and exists solely for its sake."

Unity of Mind, Sword, and Body. The single most important concept in kendo.

Kiai, sword strike, body mechanics. The principle of the one-strike kill: crush the opponent with your presence, swing with perfect accuracy, and move your body just so — spirit and blade made manifest in a single blow.

It is also a state in which everything, from the first step of the foot to the last inch of the swinging blade, links together like a single chain, detonating into explosive motion — all to force a finishing exchange that kills in one cut.

In other words, the center of the Martial is not in the self. It is in the sword.

"You temper your focus and decisiveness to refine your strikes and your body. You spar again and again to learn perseverance and restraint, so you won't be overwhelmed by an opponent's presence. It all sounds quite reasonable. Admirable, even."

I'm not saying any of that is wrong. Focus, decisiveness, the ability to meet an opponent's presence with perseverance and restraint — those are indispensable in sword arts as well.

The problem is that kendo — no, that nearly every modern martial art — pursues nothing else.

A person is supposed to master the Martial and wield it. Instead, people are being wielded by a Martial that has no substance of its own.

To put it bluntly, it's almost funny.

"There's a world of difference between pursuing Unity of Mind, Sword, and Body — and pursuing nothing but Unity of Mind, Sword, and Body."

If a person can bloom their Mental Image and swing it, then Unity ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠of Mind, Sword, and Body stops being some cumbersome technique you have to deliberately execute.

"Take my own case. Having reached my current level by pursuing Mental Image—"

I let the sentence trail off as my right arm swept through the air. The sword in my hand blurred for an instant, carving a line through empty space.

It cut nothing. And yet the killing edge born from that blade sliced through the air of the kendo gym, parting the atmosphere itself.

Shhk. A cutting sound of almost obscene cleanliness rode the microphone and drove itself into the ears of everyone watching.

"Unity of Mind, Sword, and Body is a constantly active fundamental. As natural as breathing."

I glanced over the stunned chat with one eye, then turned my head.

Standing right beside me was Namgung Yeon. Off-camera, at an angle the lens couldn't catch, the Gym Director was watching us as well.

Both of them were swordsmen who had climbed as far as competitor — and, in his case, gym director.

They would know perfectly well that the strike I'd just shown them was the perfect sword that kendo, with its doctrine of Unity of Mind, Sword, and Body, aspired to.

But given the thoroughness with which I'd just eviscerated their art, they didn't look like they could simply be pleased about it.

Which means I'll have to let them feel it for themselves.

People don't truly accept anything — no matter how reasonable it sounds — until they've experienced it firsthand. If even Namgung Yeon and the Gym Director standing right here were like that, the viewers watching through a screen would be worse.

"Now then. Do you know what this is?"

I smiled and reached into my robes, drawing out a long strip of cloth. The viewers identified it instantly.

A blindfold. Exactly what it sounded like — a thing for sealing off your vision. And, at the same time, the restriction I was about to take on.

I brought the cloth to my face, and the chat erupted in question marks. I paid them no mind. Once the blindfold was on and my vision was completely sealed, I allowed myself a faint smile.

"This is today's main content."

I slid the live blade back into its scabbard. Then, with Object Control, I drew one of the bamboo swords resting in the gym into my hand.

"I'll show you firsthand just how much the presence — or absence — of Mental Image actually matters."

This was the highlight we'd settled on a week ago, when we'd first planned the collab. Namgung Yeon, the former kendo athlete, against me, the grandmaster of modern martial arts. Two people crossing swords. What would the result be?

I just showed them a perfect strike of Unity of Mind, Sword, and Body. Blindfold or not, Namgung Yeon will come at me with everything she has.

But a single opponent was child's play to me. And any viewer with a suspicious streak might decide the whole thing was staged.

So before the spar began, I said one more thing.

"Gym Director. Any interest in coming on stream?"

"Stream? All of a sudden?"

"I figure I'll need both of you coming at me together if I want even a shred of tension."

"Haha. Well now..."

The tone was closer to a provocation than an invitation. It seemed to have landed — I could feel the Gym Director start to move.

He wasn't being obvious about it. If anything, he was suppressing his presence completely, as if he meant to take me down a peg.

"The rules are simple. You can attack from any direction — above, below, left, right, front, ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠or back. Every technique and movement normally forbidden in kendo is allowed. Use whatever means you have to. If your sword so much as touches my body, I lose."

I didn't set a time limit. The stamina of someone who hasn't built internal energy has ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠a clearer ceiling than people think. Spar for a dozen minutes at most, and the match would end on its own.

"Both of you, put on your armor. Come at me whenever you like. From wherever you like."

Me, holding a single bamboo sword, eyes covered. Two ranked practitioners, fully armed in kendo gear and armor.

By any common-sense measure, I was the one painted into a corner.

—Clack-clack!

Two consecutive cracks of impact rang through the kendo gym.

Honestly, it stung a little. No — more than a little. Her pride was hurt.

However outstanding his martial arts were, wasn't he looking down on kendo a bit too much?

A perfect strike was something to respect. But in a live spar, a single perfect technique didn't decide the match on the spot.

And yet he'd covered his eyes — and on top of that, he was willing to accept being outnumbered?

I thought I'd let go of every last attachment I had to kendo after that day.

Apparently some scrap of competitive pride had been sitting in her all along.

Namgung Yeon swallowed the thought, clenched her jaw, and settled into her stance.

The middle stance — a balanced posture equally fluent in attack and defense.

It was also the stance a kendo practitioner drilled more than any other. Namgung Yeon evened her breathing and steadied her mind.

Our win condition isn't even a scored point. If the sword touches any part of his body even once, it's over. No forbidden techniques, no restricted targets. If we go all out, there's no reason we should lose.

And though he'd stepped back from competition, the director of Gwanghwa Kendo Gym had been regarded as something close to a legend in his prime. Namgung Yeon herself stood in front of him. Behind him, the Gym Director had his sword leveled.

Simultaneous, unpredictable strikes arriving from opposite directions. Even a sloppy swing would have to land somewhere. The attack was unfair — and right now, that didn't matter at all.

Now.

Here I come.

In a fraction of a second their eyes met, and they launched together, swords already in motion.

She felt the flow of power with it. The force she drove into the floor rebounded up through her joints, her waist, her forearm, into her fingertips — and from there, into the sword in her hand.

Of every strike she had ever thrown in her life, this was the one she could most confidently call close to perfect. A successful, razor-edged execution of Unity of Mind, Sword, and Body.

Got—!

It landed. It had to have landed. The technique the Gym Director had unleashed from the opposite side was astonishingly fast and precise as well.

The corner of her mouth had just begun to lift when a dizzying weight crushed down on her skull. A shock followed, slamming through her entire body as if she'd been driven into the floor.

"...Huh?"

Her center of gravity lurched. The power drained out of her. And that was when she realized her own bamboo sword was now aimed at the waist of the Gym Director charging in from the other side.

—Clack-clack!

Two consecutive cracks of impact. Only then did Namgung Yeon understand that the pressure that had first crushed down on her head had been the Gym Director's strike. She sank to the floor.

"What in the world..."

She lifted her head, and her vision filled with the man who hadn't taken a single step from where he'd started.

She couldn't tell when he had swung, or how. She couldn't even tell whether a sword swing was capable of producing a result like this. And the man who had done it simply stood there, his expression utterly unbothered.

This was past surprising. Namgung Yeon had come face to face with a martial art that lived in a realm she could not comprehend, and she swallowed hard.

He read my strike and the Gym Director's perfectly — while blindfolded — and then guided our sword paths so that we'd suppress each other?

It was impossible. It had also, in fact, just happened.

Caught between common sense and the evidence of her own experience, Namgung Yeon felt the confusion rise, and a ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠question slipped out of her before she knew it, half a mutter.

"What... what was that just now?"

She wasn't asking what school it belonged to, or what the technique was called. It was the instinctive human reflex to try to understand the incomprehensible, in a situation that made no sense.

He didn't need to answer. But Muwon gave a short huff of laughter at Namgung Yeon's question, and did.

"...?!"

"Well. It's incomplete. But you are a Namgung, after all."

Since she carried the Namgung name, he'd figured he might as well bring out the Namgung clan's sword — unfinished as it was.

He tacked the remark on with a somewhat absurd little flourish.