Ninjutsu and spiritual practice

When you hear "ninja," you probably think of black clothing, throwing stars, and silent assassins. That is the image films and popular culture have drawn. And it is not wrong — but it is not even half the truth. Behind the martial art lies a spiritual tradition that reaches deeper than most people realise.

The actual ninja — the 忍者 Ninja or 忍び Shinobi of feudal Japan — were not only warriors. They were practitioners of a spiritual tradition that joined elements of esoteric Buddhism, Shugendō, Shintō, and shamanic Daoism. Their hand signs, their meditation techniques, their ability to keep the mind quiet under extreme pressure — none of it came from the dōjō. It came from the temple.

Kuji Kiri — the heart of ninja spirituality 九字切り

九字切り Kuji Kiri — the "nine-syllable cuts" — is the best-known spiritual element of Ninjutsu. Nine hand signs, nine mantras, nine cuts through space. In popular culture you see them again and again — in stories, films, and animation, they are one of the recurring motifs of Japanese fantasy. But hardly anyone knows where they come from. And even fewer know that they are still being practiced today.

Kuji Kiri does not originate in Ninjutsu. The ninja inherited it — from the traditions of shamanic Daoism, Shugendō, and esoteric Buddhism. The nine signs go back to the Chinese Baopuzi, a Daoist work from the 4th century. From there they traveled through Korea to Japan, where the Yamabushi — the mountain ascetics of Shugendō — integrated them into their practice. The ninja of the Iga and Kōga regions, who lived in close contact with the Yamabushi, took up the practice and made it a central element of their lineage.

Each of the nine signs activates a specific power: strength, direction, harmony, self-control, sensing danger, perceiving thoughts, mastering space and time, guiding the forces of nature, enlightenment. The ninja used them before missions — for centering, for protection, for sharpening perception. But the signs are older and deeper than any military application. They are gates into states of awareness that the monastic traditions of East Asia have cultivated for centuries.

Shugendō — the root of ninja spirituality 修験道

修験道 Shugendō — the "way of practice and trial" — is the tradition of the Yamabushi, the Japanese mountain ascetics. It is not a religion of its own, but a synthesis: esoteric Buddhism, Shintō, shamanic Daoism, and indigenous mountain spirituality, fused into a practice that uses the body as an instrument of transformation.

The Yamabushi meditate beneath waterfalls. They walk over glowing coals. They climb mountains, fast, and chant mantras in the wilderness. For them, nature is not a backdrop — it is the temple itself. And their practices — Kuji Kiri, Goma fire rituals, mantra recitation, spiritual protection rites — are precisely the practices the ninja used.

The connection is historically documented. The ninja schools of the Iga and Kōga regions lay in immediate proximity to the Shugendō centres. Many ninja were Yamabushi themselves — or had practiced with Yamabushi. The line between "mountain ascetic" and "ninja" was often fluid. And the spiritual abilities ascribed to the ninja — invisibility, premonition, mind-reading — are nothing other than the meditative capacities cultivated systematically in Shugendō.

The Togakure-Ryū and Mark Hosak 戸隠流

Mark is not only a researcher. He is Grandmaster and direct successor of Taguchi Sensei in the Ninjutsu lineage. This is a line passed down across generations — not through books, but through direct transmission, from master to successor. This connection is why Mark does not only speak about Ninjutsu, but knows it from the inside.

What Mark experienced in this lineage has shaped his entire work. The connection between Ninjutsu and esoteric Buddhism, between Kuji Kiri and Shingon, between hand signs and meditation — these are not theoretical relationships. They are lived connections, experienced in practice. His doctoral dissertation at the University of Heidelberg — The Siddham in Japanese Art — researched precisely these connections academically: the origins of Reiki, Kuji Kiri, and ritual writing in Japanese tradition.

What ninja spirituality shares with Shingon Reiki 繋がり

The connection is not constructed — it is historical. Kuji Kiri, the hand signs, the mantras, the protective rites, the ability to focus the mind and sharpen perception: all of this is found both in Ninjutsu and in Shingon Buddhism. Not because one descends from the other, but because both draw from the same sources — esoteric Buddhism, Shugendō, shamanic Daoism.

In Shingon Reiki these strands come together. The Sanmitsu practice — body, speech, mind — is the foundation. The hand signs (mudra), the mantras, and the visualisations are the same tools the ninja used. Only the context is different: not combat, but transformation. Not survival, but awakening. The power is the same — the path on which you put it to use is your decision.

For many people — especially those who first encounter hand signs and Japanese spirituality through popular stories — this very connection is the door-opener. You saw the hand signs and felt: there is something real behind this. You were right. Behind it stands one of the oldest and deepest spiritual traditions of East Asia. And it is accessible.

Ninjutsu today — beyond the martial art 現在

The military side of Ninjutsu belongs to the past. There are no more feudal wars, no espionage missions, no night raids on castles. What remains — and what is more relevant than ever — is the spiritual dimension: the ability to focus the mind, sharpen perception, move through obstacles, and stay clear in extreme situations.

You do not need these capacities on a battlefield. You need them in life. In meditation, in work, in relationships, in moments when the world becomes too much and the mind needs a quiet anchor. Kuji Kiri is exactly that anchor. Nine signs. Nine powers. A practice that has worked for centuries — not because someone believes in it, but because it activates something in body and mind that can be felt.

In Shingon Reiki, Kuji Kiri is a path of practice in its own right — with nine levels, nine initiations, and a systematic deepening that goes far beyond what can be found in any book or video. It is the path that builds the bridge between the old ninja lineage and a modern spiritual practice.