Tsukubasan Shrine — 筑波山神社

Tsukubasan Shrine sits at the base of Mount Tsukuba, a twin-peaked mountain in Ibaraki Prefecture that has been worshipped since before written records. The entire mountain is the shrine’s sacred body—its twin summits, Nyotai-san (877m) and Nantai-san (871m), are considered the physical forms of the enshrined deities themselves. Unlike most mountains in Japan’s shrine tradition, which are approached through a single path of ascent, Tsukuba offers two—one for each god, one for each peak—and pilgrims historically chose their route based on which deity they sought to petition. The mountain appears in the Man’yōshū, Japan’s oldest poetry anthology, where it is praised for allowing men and women to meet freely on its slopes during spring festivals—a striking contrast to mountains like Ōmine, which banned women entirely.

Mount Tsukuba has been a site of worship since the Jōmon period, with archaeological evidence suggesting ritual activity dating back over 3,000 years. The formal shrine structure was established during the Nara period (710-794 CE), though the mountain itself had already appeared in the Hitachi Fudoki (713 CE) as a sacred peak. During the Heian period, Tsukubasan became famous for its kagai festivals—spring gatherings where social restrictions were temporarily lifted and romantic encounters were sanctioned by divine authority. The shrine gained imperial patronage and was designated a Myōjin Taisha, one of the highest shrine ranks. The current main hall was rebuilt in 1633 during the Edo period and is designated an Important Cultural Property.

Izanagi no Mikoto and Izanami no Mikoto, the primordial couple who created the Japanese islands and gave birth to the kami, are enshrined at the twin peaks. Izanagi occupies the male peak (Nantai-san) and Izanami the female peak (Nyotai-san). This is one of the few shrines in Japan where both creator deities are worshipped together at their respective stations. The shrine serves as a pilgrimage site for couples seeking marital harmony and for those praying for successful relationships, as the two kami represent the divine model of partnership. Their messenger animals are not specified in official records, though the mountain’s natural inhabitants—particularly eagles and wild boars—are considered sacred.

The mountain’s founding legend is preserved in the Hitachi Fudoki and tells of a celestial ancestor deity who descended from heaven seeking a place to spend the night. He approached two mountains: the lofty Mount Fuji and the modest Mount Tsukuba. Fuji, proud of its height and purity, refused to offer hospitality, claiming it was in the midst of ritual abstinence. Tsukuba, though smaller, welcomed the deity warmly with food and shelter. As reward, the ancestor blessed Tsukuba with eternal prosperity and declared that people would climb it with joy throughout all seasons, while Fuji would remain cold, barren, and isolated despite its grandeur. The legend inverts the usual hierarchy of mountain worship and explains why Tsukuba has always been celebrated as an accessible, human-friendly mountain where festivals and gatherings are encouraged, while Fuji is approached with awe and distance.

The shrine complex begins at the mountain’s base with a stone torii gate marking the entrance to the sacred precinct. The main worship hall (haiden) sits approximately 270 meters above sea level, constructed in the gongen-zukuri style that connects the worship hall and main sanctuary under a single roof. Two cable cars and a ropeway provide access to the twin summits, where smaller shrine structures mark the peaks—the Otoko-taishan Shrine at Nantai-san and the Onna-taishan Shrine at Nyotai-san. Between the peaks runs a mountain trail called the Otoko-Onna River path, symbolizing the union of the two deities. At the base shrine, massive cedar trees estimated to be over 800 years old surround the main hall, and a spring called Tsukuba-sui is said to flow from the mountain’s divine body.

• Omidare-sai (April 1) — The spring mountain-opening festival, historically associated with the kagai tradition where men and women would meet freely on the mountain slopes. Today it features processions and prayers for good harvests.
• Gozengamine-sai (October) — An autumn festival celebrating the mountain’s deities with ritual offerings at both summit shrines and a procession connecting the twin peaks.
• New Year Hatsumode — One of Ibaraki’s most popular New Year shrine visits, with visitors climbing to both peaks to receive blessings from both creator deities.
• Tsukiyomi-sai (Monthly) — Monthly moon-viewing rituals held at the summit shrines during full moons, reflecting the mountain’s ancient association with celestial observation.

November, when the autumn foliage transforms the mountain into a tapestry of red and gold. The twin peaks become distinct visual features against the colored forest, and the cable car journey offers panoramic views across the Kanto Plain to Mount Fuji on clear days. Early morning visits avoid crowds and allow you to experience the sunrise from the eastern-facing Nyotai-san peak. Late April brings the mountain-opening festival and blooming azaleas along the lower trails. Winter offers the rare sight of frost-covered trees near the summit, though the cable cars may suspend service during severe weather.