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Chichibu-Tama-Kai NP, Yamanashi
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At Daibosatsu Pass, Kosuge villagers left charcoal, konnyaku and wasabi by shrines; Hagiwara sent rice and sake. Loads waited there all winter, and historical records say none were stolen.
Nakazato Kaizan’s novel Daibosatsu Tōge begins at the pass just south of this summit. He serialized it from 1913 to 1941, but the 41-volume saga was still unfinished when he died.
West of Daibosatsu Pass, researchers found 50–120 cm boulders beneath soil and vegetation. They identify the slope as an Ice Age landform, shaped when freeze-thawed rock slowly crept downhill.
A local legend says warrior Yoshimitsu was guided over the mountain on his Oshu campaign by a woodcutter said to be a war god in disguise. In gratitude, he cried “Hachiman Daibosatsu”—the name’s origin story.
At nearby Unpoji Temple, Koshu holds the April Kaisan-sai for the mountain opening. The community remembers novelist Nakazato Kaizan and prays for hikers’ safety, linking literature with a living local ritual.
Despite rising to 2,057 m, Mount Daibosatsu’s summit is enclosed by forest and has no panorama. The open ridge toward the neighboring pass is the real balcony, with views of Fuji and the Southern Alps.
Yamanashi’s 111-hectare Daibosatsu wildlife-protection zone records Japanese dormice, foxes, bears and serow—plus a varied birdlife, from subalpine warblers to familiar lower-slope songbirds.
Daibosatsu’s open ridge needs active plant protection: Yamanashi identifies deer grazing as a biodiversity threat, while park rangers inspect and repair fencing after lodge staff reported deer chewing holes in the mesh.
