Episode 1The One Night That Created the NinjaThe Battle of Magari (Koga Ninja Night Raid)
On the night a shogun's army tens of thousands strong closes in on a mountain village, Genta, a timid young man of Koga whose only gift is his sharp hearing, holds his breath beneath the floor of the enemy camp. "We don't kill them. We just never let them sleep." By lamplight, an old writer begins the tale of the night that first made the shinobi famous.
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Story summary
The story comes from the Bansenshukai, often described as the great encyclopedia of ninjutsu. Its compiler, Fujibayashi Yasutake, came from the Fujibayashi family of Iga. He gathered the techniques handed down in Iga and Koga, the two mountain regions most closely tied to the shinobi (ninja), and put them into one work. The preface explains the title: just as ten thousand rivers flow into one sea, many schools of the art flow together into this book. In the opening volume, Yasutake uses a question-and-answer format to argue that ninjutsu is not a thief's trick.
Battle of Magari (1487) Explained: How the Koga Ninja Became Famous – Bansenshukai
In short: The Battle of Magari (Magari no Jin) was a 1487 campaign in which the shogun Ashikaga Yoshihisa led an army into Ōmi Province against the warlord Rokkaku Takayori, and the fighters of Iga and Koga did such remarkable work that their names became famous across Japan. This origin story is told briefly in the Bansenshukai, a ninja manual compiled by Fujibayashi Yasutake with a preface dated 1676. Episode 1 of the manga NINJA: Shadows of the Warring States turns that short note into a night-raid drama seen through the eyes of a young Koga villager.
What the Original Source Says
The story comes from the Bansenshukai, often described as the great encyclopedia of ninjutsu. Its compiler, Fujibayashi Yasutake, came from the Fujibayashi family of Iga. He gathered the techniques handed down in Iga and Koga, the two mountain regions most closely tied to the shinobi (ninja), and put them into one work. The preface explains the title: just as ten thousand rivers flow into one sea, many schools of the art flow together into this book.
In the opening volume, Yasutake uses a question-and-answer format to argue that ninjutsu is not a thief's trick. In his view, it is a branch of military strategy, and it only works when it rests on a commander's wisdom and on a correct, upright heart, a principle he calls seishin. In the middle of this discussion, he explains how the shinobi of Iga and Koga first won their reputation. During the Chōkyō era, the shogun Ashikaga Yoshihisa marched against Sasaki Rokkaku Takayori of Ōmi and set up camp at Magari. The men of Iga and Koga performed remarkable service there, and from then on people across the land held the names "Iga-mono" and "Koga-mono" in high regard.
That is nearly all the source says about it. The Bansenshukai does not describe the night raids, the fires, or the shogun's death. It treats Magari as an origin point for the ninja's fame, not as a story told in detail.
The History Behind the Legend
Historians and later tradition fill in more of the picture, though these details are not from the Bansenshukai. In 1487, the young shogun Yoshihisa personally led a large army to punish Rokkaku Takayori, a regional lord who had been seizing lands that belonged to temples, nobles, and shogunal retainers. Rather than defend his main castle, Takayori is generally said to have withdrawn into the hills of Koga and kept up the fight from there.
Local Koga tradition holds that the area's small landholding warriors (jizamurai) hid by day and slipped into the shogun's camp by night, setting fires, stealing supplies, and keeping a vast army from ever resting. How much of this is solid history and how much is later legend is debated. What is well documented is that the campaign dragged on, and Yoshihisa died in his camp at Magari in 1489. Some Koga families later traced their status, such as the groups known as the "Koga 21 Families" or "Koga 53 Families," to service in this war. That is a Koga family tradition, not something the Bansenshukai records.
Main Characters
Fujibayashi Yasutake is the compiler and the narrating voice of the preface and dialogue. The source tells us nothing about his face or age, only his purpose: to present the shinobi as honorable strategists.
Ashikaga Yoshihisa, the ninth Muromachi shogun, appears in the source only as the leader who camped at Magari. Rokkaku Takayori, the lord of Ōmi, appears only as the man he came to punish. The men of Iga and Koga are mentioned as a group, without a single named individual or any description of how they fought.
What the Story Tells Us
The Magari episode matters because it shows how the ninja's image was shaped. By the 1670s, Japan had been at peace for decades, and the old skills of Iga and Koga risked being forgotten or dismissed as the work of sneak thieves. Yasutake pointed back to a famous moment when local fighters held off a shogun's army, and used it to argue that these were respectable military arts with a proud history.
It also reflects a real feature of late medieval Japan. Places like Koga were run by networks of small, self-governing warrior families who knew their mountains intimately. Against a large, slow army far from home, local knowledge, mobility, and night operations could matter more than numbers.
What the Manga Changes
Because the source is so brief, Episode 1 of NINJA: Shadows of the Warring States adds a great deal of its own, and it helps to know which parts are invented. The hero, Genta, a timid young Koga man whose one gift is his sharp hearing, is completely original, along with his family and his growth. So are the specific scenes: hiding beneath the floor of the enemy camp, the plan summed up as "We don't kill them. We just never let them sleep," the fires, the stolen supplies, and the exhausted soldiers.
The manga also links Yoshihisa's illness to the long, sleepless campaign and compresses the time before his death in 1489, which the source does not mention. Conversations between Takayori and the Koga warriors are imagined. The framing scenes, in which Yasutake tells the tale by lamplight in his study, are a creative device, and the gear and clothing are designed to fit the period rather than copied from any record.
Where to Read It
If you want to see this short line from the Bansenshukai come alive, you can read Episode 1, "The One Night That Created the Ninja," right here on Manga Portal. Every episode of NINJA: Shadows of the Warring States is free to read, with no sign-up needed. It's an easy way into the real history of Iga and Koga, and a good starting point for the rest of the series.
Characters in this episode
Fujibayashi Yasutake
An Iga-born compiler who gathered the ninja arts of Iga and Koga into the Bansenshukai and argued they were an honorable form of strategy.
Ashikaga Yoshihisa
The ninth Muromachi shogun, who camped at Magari in 1487 to attack Rokkaku Takayori and, historically, died there in 1489.
Rokkaku Takayori
The lord of Ōmi Province targeted by the shogun's campaign, traditionally said to have withdrawn into the Koga hills.
The men of Iga and Koga
Local warriors whose service at Magari, according to the Bansenshukai, made the names of Iga and Koga famous across Japan.
Genta (manga original)
A timid young Koga villager with extraordinary hearing, created for the manga as its point-of-view hero.
FAQ
What was the Battle of Magari?
It was a campaign that began in 1487, when the shogun Ashikaga Yoshihisa camped at Magari in Ōmi Province to attack the warlord Rokkaku Takayori. The campaign dragged on, and Yoshihisa died in camp in 1489.
Why is the Battle of Magari important to ninja history?
The Bansenshukai says the fighters of Iga and Koga performed so well at Magari that their names became famous throughout Japan. It is often cited as the moment the Koga and Iga shinobi first gained a nationwide reputation.
What is the Bansenshukai?
It is a large compilation of ninja techniques from Iga and Koga, put together by Fujibayashi Yasutake with a preface dated 1676. Its title suggests many rivers gathering into one sea, meaning many schools collected in one book.
Did Koga ninja really raid the shogun's camp at night?
Koga tradition and later accounts say local warriors harassed the camp at night with fires and supply raids, but the Bansenshukai gives no such details. Historians treat the specifics as uncertain, partly legend and partly history.
Is Genta a real historical person?
No. Genta is an original character created for the manga to let readers experience the night raids from the inside. No individual Koga fighter is named in the source.
