樹海は囁く。

樹海は囁く。

樹海は囁く。

樹海では“ 自然が神” だと、素直に思える、という話。

樹海は囁く。

樹海は囁く。
Why the Jukai Forest makes it easy to believe "nature is God"?

Feature | 2026.10.19


Why the Jukai Forest makes it easy to believe “nature is God”?

Even when people say, “nature is God,”
it sounds like a distant concept in the city.
In the the Aokigahara Jukai Forest or “Sea of Trees”,
however, it is entirely different.
Rain-soaked moss turns a deeper green,
and roots stretch through lava crevices. Atop fallen trees,
new life is already growing. Here, human convenience holds no power.
People pray toward Mt. Fuji, and ascetic monks (shugenja)
venture into the woods and caves.
Why did they go to such lengths? Even the phrase “being permitted to enter the mountain” feels entirely natural here.
Staying at a Oshi pilgrim lodge, walking with shugenja,
and entering the rain-kissed forest…
In this issue, we explore at the foot of Mount Fuji
why humanity has long revered nature as divine.

On the day of our visit, Mt. Fuji remained hidden behind clouds.
Arriving at its foot without a view was disappointing,
yet continuing our journey revealed that Mt. Fuji is not meant merely to be admired from afar.
From the memories of the Fuji-ko (Devotional Fuji confraternities)pilgrimage preserved in the
Oshi lodges to lava beds beneath the Jukai forest
—even unseen, the mountain’s power was present everywhere.

Our journey began at Naritasan Fukagawa Fudoudou in Tokyo, leading to Zuzuya, a Oshi pilgrim lodge at Fuji’s foot. After visiting Maoten Shrine, we entered the Aokigahara Jukai forest with shugenja.
Tracing Fuji-ko history and listening to mountaineers shifted our eyes to the forest’s origins. Walking here reveals why faith and nature unite.
Mt. Fuji looks serene from afar, yet Aokigahara was forged by violent lava. We sought to understand why people pray to—and trek toward—a mountain that once threatened their lives.
We feel something beyond humanity in trees, rocks, mountains, and caves. Later labeled as animism, it was likely a far more immediate, everyday reality for ancient people. Folklore scholar Kunio Yanagita believed that when old faiths fade, gods drop into mere monsters. Revering the sacred and fearing the unknown are surprisingly close. Whether we view the forest as beautiful or terrifying reveals less about nature itself than about the human heart.
In daily life, time and paths are arranged for human convenience, but that logic fails inside the Jukai forest. Stepping over roots, dodging slick moss, and searching for foothold gradually pushes daily worries away. As your pace slows, you see more—a sensory shift felt in the body rather than explained by logic.
At your feet, fallen trees rot under moss as new sprouts rise. The forest is not a finished scene, but an unfolding passage of time, supported by water, soil, and microscopic life.
Tracing the path of Mt. Fuji worshipers, walking with an ascetic monk, and learning the forest’s origins in the rainy Jukai reveals fewer answers about nature and more clues to reconsider human existence.
Upon leaving the forest, how will everyday life appear?

信仰の道行きに樹海の自然があった、「富士講」。
The "Fuji-ko" pilgrimage: finding faith within the Jukai Forest.

Feature | 2026.10.19


The “Fuji-ko” pilgrimage: finding faith within the Jukai Forest.


Mt. Fuji was visible even from Edo, a white peak against the clear western sky. Seeing it daily, people naturally longed to visit.
Yet Fuji was distant, requiring days on foot and substantial funds. It was no trip to make on a whim.
To bridge this gap, communities formed local groups called “ko.” Members pooled money, choosing representatives by lottery to make the pilgrimage. In some groups, those who returned continued contributing so others could take their turn. The “ko” served as both a faith organization and a collective travel savings fund.
The journey began at Nihonbashi toward the Yoshidaguchi entrance via the Koshu Kaido and Fuji Road to Kamiyoshida. Fast walkers could reach present-day Fujiyoshida in just two nights—a remarkable feat of endurance.
In Kamiyoshida, pilgrims were welcomed by “Oshi,” practitioners who performed prayers, distributed amulets, and hosted travelers. Their residences, known as “Oshi houses,” functioned as inns, prayer halls, and preparation hubs for entering the mountain.

During our trip, we stayed at Zuzuya, one of these historic Oshi houses. Walking down the narrow tatsumichi path toward the main house, spending a night here makes the past tangible—picturing tired pilgrims in straw sandals resting before their morning ascent.
Kamiyoshida was built around the path to Mt. Fuji, relocated in 1572 to escape meltwater floods. Marked by the Kanadorii gate and Kitaguchi Hongu Fuji Sengen Shrine, the town reflects a pre-Meiji era when Shinto and Buddhism coexisted on the mountain.
For those unable to travel, mini replica mounds called fujizuka were built in Edo using actual lava rocks. Place names like Fujimi across Tokyo show how deeply connected people felt to the peak.
Trekking for days with companions carried sacred weight, yet it also brought the simple joys of travel and stories to share. Seeking the divine while enjoying the journey was a deeply human pursuit.
Meanwhile, ascetic monks, “shugenja” lived this faith through a very different physical experience.

修験者は、山のてっぺんは目指さない。
For shugensha, reaching the top is not the goal.

Feature | 2026.10.19


For shugensha, reaching the top is not the goal.


Why do shugenja walk into the mountains instead of driving as far as possible? If efficiency were the goal, choosing the harder path makes no sense.
During an interview, one explained: “Reaching the summit is not the objective.”
For ordinary hikers, the peak is everything. For shugenja, what matters is being permitted to enter and pray. Even if turned back at the seventh station by bad weather, they return with gratitude—a mindset far from conquering nature.
We instinctively assign goals to everything: distance, speed, achievement. Shugendo leaves efficiency behind.
In the mountains, shifting weather shatters human plans. Soaked and freezing, one suddenly appreciates a simple roof or warm bed. Experiencing this awakens the realization that nature itself is divine. Around Mount Fuji, ascending the summit was never the only path; lava caves created by eruptions have long served as sacred grounds for prayer and discipline.

A prime example is Hitoana, an 83-meter lava cave near the Jukai forest. Recorded in Azuma Kagami as a divine dwelling, Fuji-ko founder Hasegawa Kakugyo secluded himself here for ascetic practice. Over 200 stone monuments built by followers still stand at the site.
The forest also shelters Shojin Oana, used for fasting practices, and Ryugu Cave, where locals prayed to a water deity during droughts.
Inside a cave, light disappears and temperature drops. Unlike admiring a mountain from afar, you step directly into darkness forged by the mountain itself—a physical realization of shugensha faith.
Even attire blends prayer with utility: the forehead-worn “tokin” serves as both a sacred tool and a protective helmet or water cup.
As a shugenja noted, “Training back in the village is harder.” Bringing mountain insights into daily life, work, and human conflict is the true, lasting practice.
A shugenja’s training continues long after descending the mountain.

樹海の深奥に、神を見る。
Finding the sacred deep within the Jukai forest.

Feature | 2026.10.19


Finding the sacred deep within the Jukai forest.


The word Jukai carries heavy baggage: dark, ominous, impossible to escape. Pop culture constructs a vivid picture even for first-time visitors—and I was no exception.
It rained on the day of our coverage. Low clouds hid Mt. Fuji, but stepping into the forest changed my perspective. Despite the overcast sky, the woods were far brighter than expected. Moss drank in moisture, tree trunks glistened black, and leaves deepened into layered shades of green. Nature was intensely, almost overwhelmingly alive.
Curiously, despite heavy rain, puddles were nowhere to be found. The ground—porous lava filled with fissures—absorbed rainfall instantly, leaving a wet yet firm path.
The forest floor is rugged, strewn with jagged lava and exposed roots that demand careful steps. As your walking pace slows, details come into focus: diverse mosses clinging to a single trunk, young saplings rising beside fallen trees, and the clear crunch of your boots above the gentle patter of rain.
The beauty of Jukai forest is not about chasing an iconic vista; walking here transforms your senses. A cavernous opening appears—a gaping black lava cave that gives you pause. Knowing shugensha and Fuji-ko pilgrims trained here gives that darkness profound weight.
Mt. Fuji appears symmetrical from afar, yet its base reveals twisted lava, gnarled trees, and creeping roots. New life sprouts atop fallen trunks. Facing this overwhelming force feels humbling, even unnerving.
Though Mt. Fuji remained hidden that day, we walked ground shaped by its hand. The lava beneath our feet confirmed we were part of the mountain.
It leaves you wondering: how did such a lush forest emerge from barren rock?

樹海、未来へのエコロジー。
The ongoing journey of a twelve-hundred-year-old forest.

Feature | 2026.10.19


The ongoing journey of a twelve-hundred-year-old forest.

The Aokigahara Jukai forest began as a barren expanse of black lava. The Jogan eruption of Mt. Fuji in 864 AD unleashed a massive lava flow, upon which today’s forest slowly emerged over roughly 1,200 years. While 1,200 years sounds immense, in forest time, Aokigahara is surprisingly young.On nutrient-poor lava devoid of water, mosses and ferns took root first. Wind-borne seeds drifted in, followed by birds and insects. As decaying plant matter formed a thin layer of soil, this gradual accumulation built a forest atop the solid rock.
Because soil sits just centimeters deep above solid lava, tree roots cannot anchor downward, creeping horizontally instead. Trees survive by drawing rainwater stored not deep underground, but within the sponge-like moss covering the surface.
With shallow roots, trees fall easily. Yet fungi decompose the fallen wood, creating fertile ground where seeds sprout and grow—a self-sustaining cycle known as nurse log regeneration.
In thin soil, decaying trunks serve as nurseries for new life, prompting saplings to line up atop fallen logs. A fallen tree opens the canopy to light—here, even dying is part of the forest’s work. Though suited for broadleaf trees, Jukai is dominated by hemlock and cypress, mixed with oak and maple. Despite its rugged look, the ground is fragile. Repeated footsteps damage surface flora, taking years to recover—hence strict eco-tour rules.
Grasping these mechanics shifts your view: shallow soil, crawling roots, moss holding water, and saplings on logs reveal a living system.
A forest 1,200 years in the making remains a work in progress. Sprouts rise from logs, destined to fall in turn. Our single day in Jukai was merely a frame in a vast continuum.
What this forest looks like a thousand years from now is beyond knowing, yet that future has already begun—a shared path for humanity and the woods.

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