Visiting the Real Battlefield Made Nobunaga’s Ambition 10x More Fun｜A Trip to Sekigahara & Ogaki Castle

[画像: 大垣城天守の外観、または関ヶ原古戦場の風景 — 後で差し替え]

“I never expected to fall back in love with Nobunaga’s Ambition in my thirties.”

It was the game I obsessed over as a kid. Once I started working full-time, I figured I’d “graduated” from gaming for good — and yet lately I’ve been hooked on it deeper than ever.

It all started with a single trip.

Just a few hours walking the old Sekigahara battlefield (the 1600 clash that decided who would rule all of Japan) and standing inside Ogaki Castle, the western army’s home base.

I got home, casually fired up my Switch — and the next thing I knew, the sun was coming up.

In this post I’ll tell you how I, a guy in my thirties, got pulled back into Nobunaga’s Ambition. This isn’t just a game review. It’s about how visiting the real historical sites deepened my love of history, and even the lessons about business I only noticed as an adult.

If you’re around my age and feeling like “I just don’t have anything I’m passionate about lately,” I’d be happy if this gives you one idea worth trying.

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🏯 The spark was Sekigahara and Ogaki Castle

When you stand at a real historical site, the game’s “resolution” changes completely.

For me, that was Sekigahara and Ogaki Castle.

At Sekigahara, I stood frozen: “This is where the country’s fate was decided?”

Sekigahara turned out to be a much smaller basin than I’d imagined.

That famous decisive battle I’d read about in textbooks — the moment you stand there, you instantly understand why it was over in half a day. The eastern and western army camp sites sit within walking distance of each other, and if you climb Mt. Sasao, you see the very same view that Ishida Mitsunari (the general who led the western army) would have been looking at.

“So this is where Kobayakawa Hideaki switched sides.” “This is where Ieyasu was giving his orders.”

People who were just names in history class suddenly start moving as living, breathing humans. That feeling is irresistible.

The moment I reached the western army’s HQ, a sharp pain shot through my neck

Let me tell you something a little strange.

The instant I arrived at Mt. Sasao — the site of the western army’s headquarters, Ishida Mitsunari’s own command post — a sharp pain suddenly shot through my neck.

I hadn’t felt a thing up until then, but the moment I stood where the command post had been, my neck went heavy. It wasn’t a crick from sleeping wrong, and it wasn’t fatigue from driving. The discomfort clearly started only after I arrived at that spot.

Normally I’m pretty indifferent to anything psychic or spiritual. But just that once, I definitely felt “something.”

Mt. Sasao is where the western army suffered a crushing defeat. It was the camp of the side that was betrayed, overrun, and destroyed. Mitsunari himself fled from here and was eventually executed at Rokujo-gawara in Kyoto.

Maybe the memory of that lost battle is soaked into the land — words I’d never normally use just floated up into my head naturally.

Even after I got home, the strange feeling in my neck lingered for a while.

Maybe it’s not something you can explain scientifically. Even so, it was the moment the realization that “four hundred years ago, something really did happen in this place” got carved not into my head, but into my body.

Standing at a real historical site — including experiences like this — is so much richer than any game screen, dozens of times over.

At Ogaki Castle, I wondered: “What was Mitsunari thinking here?”

The other place I visited was Ogaki Castle.

Ogaki Castle is a flatland castle standing right in the middle of the plain. Unlike castles perched on mountaintops, it’s on ground that’s continuous with the town. That’s exactly why I could feel, much more intimately, how memories of the Warring States era still linger within modern daily life.

It was only when I visited Ogaki Castle that I learned this was the castle where Ishida Mitsunari and the western army had their headquarters right up until the eve of the Battle of Sekigahara.

Walking through the keep, a thought struck me.

“What was Mitsunari thinking, right here?”

How to respond to Ieyasu’s advance. Where to force the decisive battle. Would his allies, the Mori and Kobayakawa, really make their move?

We who know history already know the ending — the western army’s crushing defeat. But standing here at the time, Mitsunari must have been planning his strategy fully intending to win.

Standing at the actual site, I felt like I could relive, just a little, “the perspective of someone acting without knowing how it ends.”

And the place Mitsunari marched off to from here was Mt. Sasao — the very spot where I felt that pain in my neck.

Ogaki Castle to Sekigahara is about a 30-minute drive. On the way home, it hit me: without realizing it, this whole trip had been a journey retracing Mitsunari’s fate.

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🎮 How I enjoy it now is the complete opposite of how I did as a kid

Back home, I booted up Nobunaga’s Ambition: Awakening.

At first I started with a “this brings back memories” kind of feeling, but I noticed it right away. The way I enjoy this game now is totally different from when I was a kid.

How I played as a kid

Honestly, my childhood Nobunaga’s Ambition went something like this.

• Start as Nobunaga or Hideyoshi
• Gather strong generals and snowball into something huge
• Pull off a surprise attack at Okehazama and call it a day

Basically, I played it as “a game where you collect strong generals and brawl.”

How I play now, in my thirties

Now it’s completely different.

• Pick a weak, minor lord and build a long-term strategy
• Spend time developing domestic affairs (gold mines, merchant towns, farmland)
• Work diplomacy through alliances, marriages, and hostages
• Think about recruiting talent and putting the right person in the right role
• Pay attention all the way down to succession and inheritance issues

In short, the domestic management and diplomacy are more fun than the fighting.

The quiet, paperwork-like business of command is way more interesting to me than flashy, hack-and-slash action. I think it’s precisely because I’ve experienced running an organization and allocating budgets at work that I now find joy in the fine details — the balance between a general’s stats and their stipend, the income-and-expenses math of a domain, all of that.

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🎯 Five reasons adults get hooked

Why does this game grip you so hard once you hit your thirties? I tried to sort out my own reasons.

① It’s an immersion that absolutely melts time away

Once you enter the other world of the Warring States era, your sense of real-world time disappears entirely.

You start thinking “just 30 minutes,” and three hours have gone by before you know it — that’s the norm. Work stress and the nagging worries in your head completely vanish while you’re plotting your warring-era strategy.

② It resets your whole day

Play at night and, strangely, your mood flips over.

It’s close to the feeling of getting “totonou” — that blissed-out clarity people get from a sauna. I think it’s because the part of your brain you use is completely different from the part you use at work.

③ You can go at your own pace

Unlike online games, nobody rushes you.

You can advance a turn in a five-minute gap, or lose yourself in it for hours on a day off. It fits the rhythm of an adult’s life.

④ The reassurance that you can redo your mistakes

You can save and load. You have no idea how much of a relief that is for an adult.

Work and life are hard to redo, but inside the game you can try out strategies as many times as you like. An environment where you can “try bold moves without fear of failure” is honestly hard to find for grown-ups these days.

⑤ Your historical knowledge grows naturally

As you play, the names of generals, place names, and events sink into your head.

And the next time you travel, the “resolution” of the place goes up even more. The virtuous cycle of game → travel → game begins. That’s the best part.

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💼 The essence of business, learned from Nobunaga’s Ambition

Playing this game, I think it over and over.

“Isn’t this the very essence of running a business?”

A feel for resource allocation

Gold, rice, soldiers, talent, time — all of them are finite.

Where do you invest, and where do you hold back? Earn in the short term, or nurture for the long term? You repeat exactly the same judgment calls as project management at work.

Diplomacy = the essence of negotiation

Grow your allies, divide your enemies. Sometimes you team up with the enemy of your enemy; sometimes you bow your head to a powerful foe and submit.

The idea of selection and focus — “You don’t have to win every battle. Concentrate only on the battles worth winning” — is the business front lines themselves.

Long-term strategy beats short-term tactics

Do you burn through soldiers to seize one castle right in front of you, or thicken your domestic base with an eye on five years from now?

Even if you score flashy short-term wins, a lord whose long-term strategy is wobbly will always collapse. Honestly, this is a scene you see all the time at work too.

Recruiting talent and the right person in the right role

Put high-intellect generals on domestic affairs. Put high-valor generals on the front lines. Give a stipend to retainers with low loyalty.

As a textbook for learning organizational management, there’s no clearer subject than this.

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🌏 Japan’s Warring States era — something I especially want people overseas to know

At Pon’s Hobby Room, I’m planning to launch an English edition in about six months. And one of the very first subjects I want to introduce then is Japan’s Warring States (Sengoku) era.

Drama on par with Shakespeare

The race for the realm between three men — Nobunaga, Hideyoshi, and Ieyasu. I honestly think this is drama on a level with world literature.

• Nobunaga, who shattered conventional wisdom with overwhelming innovation
• Hideyoshi, who rose from a lowly sandal-bearer all the way to ruler of the land
• Ieyasu, who won by outlasting everyone

Three different ways of living, three different ends. The density of the story is insane.

The ultimate material for talking about Japanese culture

The Warring States era is packed with culturally rich elements too — the tea ceremony, ink-wash painting, trade with the Europeans, and the arrival of Christianity.

If you want to convey the true depth of Japan to people overseas who only know “samurai” and “ninja,” I’m convinced the Sengoku era is the most powerful content there is.

Nobunaga’s Ambition should land with history buffs abroad too

Since the series has English versions, if you have a friend overseas who loves Japanese history, definitely recommend it to them. The keyword “Sengoku” gets understood abroad far more than you’d expect.

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📘 For those starting out｜Recommended titles and how to enjoy them

For anyone thinking “I’m getting a little curious,” let me lay out the entry point.

Recommended title

The latest entry, Nobunaga’s Ambition: Awakening, is the one I most recommend for beginners.

• The UI is modern, so even series newcomers can get into it
• The generals’ autonomous behavior is fun (your retainers make suggestions on their own)
• Available on PS5, Switch, and PC (Steam)

If you’re unsure about the series, it’s not too late to try the Switch demo first and then decide.

Related books are a great way in too

There are books that double the fun if you read them before — or alongside — the game.

• Ryotaro Shiba, Kunitori Monogatari (the story of Saito Dosan and Oda Nobunaga)
• Hiroshi Kato, Nobunaga no Hitsugi (“Nobunaga’s Coffin,” a mystery chasing the secret of the Honno-ji Incident)

You can listen to both on Audible. Having them in your ears during your commute or a workout makes the thrill of hearing those names pop up in the game completely different.

History spots I want to visit next

Here are the Sengoku spots I’m hoping to visit going forward.

• Gifu Castle (atop Mt. Kinka, where Nobunaga conceived his “Tenka Fubu” vision of unifying the realm)
• Komakiyama Castle (the first castle Nobunaga ever built)
• The Azuchi Castle ruins (the crystallization of Nobunaga’s grand design)
• Nagahama Castle (the castle of Hideyoshi’s rise)
• Nijo Castle (the prestige of the Tokugawa shogunate)

Going back and forth between the game and travel deepens your understanding of the Warring States era all at once.

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📝 Wrap-up｜Hobbies enrich your life

“Falling back in love, as an adult, with a game from your childhood.”

I’ve recently realized this is a surprisingly happy thing.

It’s precisely because responsibilities at work and home keep piling up in your thirties that time to fully lose yourself in your own world matters so much.

Nobunaga’s Ambition isn’t just a game. It’s something where you can:

• Learn history
• Train your strategic thinking
• Find motivation to travel
• Relieve stress
• Touch a part of Japanese culture you can proudly share with people overseas

It’s a grown-up hobby you can enjoy on so many layers, I think.

If you’re around my age and feeling like “I just don’t have anything that grabs me lately,” definitely try walking the real sites (Sekigahara or Ogaki Castle) first, and then boot up the game. The resolution of the experience should be on a whole different level.

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📣 Want to go deeper?｜Digging in over on note

At Pon’s Hobby Room, I also share the deeper stories I can’t fully fit into the blog over on note.

I’m planning to write paid pieces there that go one step further than the blog — things like “how to play AI × strategy simulations” and how to enjoy grown-up hobbies using an AI assistant.

▶ note: Pon’s Hobby Room (in Japanese)

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Pon