Sessho-seki

Lore & Background

According to Japanese mythology, the Sessho-seki is believed to be the transformed corpse of Tamamo-no-Mae, a beautiful woman who was exposed as a nine-tailed fox working for an evil daimyō plotting to kill Emperor Konoe and take his throne. In the otogi-zōshi, when the nine-tailed fox was killed by the warrior Miura-no-suke, her body became the Sessho-seki. Later, a Buddhist priest named Genno stopped near the stone and was threatened by the spirit of Tamamo-no-Mae. Genno performed exorcism rituals and begged the spirit to consider her salvation, and Tamamo-no-Mae relented, swearing never to haunt the stone again.

Reader's Guide

The Sessho-seki holds significance as a physical manifestation of a key Japanese myth, blending natural volcanic phenomena with folklore. Its legend, involving a shape-shifting fox and a priest's exorcism, has been retold in various cultural forms, including a Noh play attributed to Hiyoshi Sa'ami, a mention in Matsuo Bashō's 17th-century travelogue Oku no Hosomichi, a novel by Kido Okamoto, and a 1968 anime film. The stone's reported split on March 5, 2022, due to natural weathering, sparked public fear of the exorcised kitsune, leading to a local government ceremony on March 26, 2022, where priests offered prayers, offerings, and waved haraegushi to appease the spirit. This event demonstrates the enduring power of the legend in contemporary Japan, where a geological occurrence is interpreted through a mythological lens. The stone remains a representative example of how volcanic toxic gas sites are named 'Killing Stones' in Japan.

Did You Know?

• The Sessho-seki is located in the volcanic mountains of Nasu, Tochigi Prefecture, Japan, an area known for sulphurous hot springs.
• The stone is believed to be the transformed corpse of Tamamo-no-Mae, a nine-tailed fox killed by the warrior Miura-no-suke.
• On March 5, 2022, the stone split into two parts, likely due to natural weathering.
• A Buddhist priest named Genno performed exorcism rituals on the stone, after which the spirit of Tamamo-no-Mae swore never to haunt it again.

The Legend of Tamamo-no-Mae

The Sessho-seki's most enduring story traces back to the otogi-zōshi, a collection of Japanese narrative tales. According to this legend, the stone is nothing less than the petrified remains of Tamamo-no-Mae, a woman of striking beauty who was ultimately revealed to be a nine-tailed fox in disguise. She had been in the service of a wicked daimyō whose ambition was to assassinate Emperor Konoe and seize the throne for himself. The fox's deception was finally ended when the renowned warrior Miura-no-suke slew her, and her body transformed into the very rock that stands in the Nasu mountains. The legend does not end with her death. A Buddhist priest named Genno later paused to rest near the stone and was confronted by Tamamo-no-Mae's restless spirit. Through exorcism rituals and earnest pleas for her salvation, Genno moved the vengeful fox to relent. She swore an oath never to haunt the stone again, bringing a measure of peace to the site that has persisted for centuries.

The 2022 Splitting and the Appeasement Ceremony

On March 5, 2022, the Sessho-seki suffered a dramatic physical change when it split into two separate pieces. The most likely explanation was natural weathering, a slow geological process that had been acting on the rock over time. Yet the event immediately stirred public imagination, with some observers voicing fear that the exorcised kitsune spirit of Tamamo-no-Mae might be stirring within the fractured stone. The local government responded with a formal religious ceremony on March 26, 2022, bringing priests to the site to perform rites of appeasement. The ceremony was designed to pacify the beast and soothe the spirit through traditional means: prayers were offered, ritual gifts were presented, and priests waved haraegushi, sacred purification branches, directly over the now-divided rock. The episode underscored how, even in the modern era, the Sessho-seki continues to occupy a space where geology and mythology intersect, where a simple act of erosion can be read through the lens of a centuries-old supernatural narrative.

Geological Setting and the Naming Tradition

The Sessho-seki sits within the volcanic highlands of Nasu, a region in Tochigi Prefecture, Japan, well known for its sulphurous hot springs. This geological setting is not incidental to the stone's reputation. In Japanese tradition, large rocks and boulders found in areas where volcanic toxic gases seep into the atmosphere are commonly given the name Sessho-seki, a term that translates directly as Killing Stone. The underlying logic is practical: in mythological framing, the stone kills anyone who touches it, but in reality the danger comes from the noxious fumes that accumulate around such formations. The Nasu stone is considered the most representative example of this broader category of volcanic killing stones across Japan, elevated in cultural prominence by its association with the Tamamo-no-Mae legend. The combination of genuine geological hazard and rich mythological narrative has made this particular rock far more than a simple geological curiosity, transforming it into a site where the natural and supernatural worlds are understood to overlap.

A Legacy Across Centuries of Art and Storytelling

The Sessho-seki and its legend have permeated Japanese artistic and literary traditions across centuries. In the 17th century, the great poet Matsuo Bashō visited the stone and recorded his experience in his travelogue Oku no Hosomichi, lending the site a place in one of Japan's most celebrated literary works. A Noh play centered on the stone is attributed to the playwright Hiyoshi Sa'ami, embedding the legend in Japan's classical performing arts. In modern times, the narrative inspired Kido Okamoto's novel Tamamo-no-Mae, which was subsequently adapted into a film. A 1968 anime film titled Kyuubi no Kitsune to Tobimaru (Sesshouseki) brought the nine-tailed fox story to a new generation of audiences. Even in contemporary manga, the legend finds fresh life: chapter 123 of Bakidou uses the image of the rock splitting as a visual metaphor to demonstrate the extraordinary kicking power of one of its characters. From classical poetry to modern animation, the Killing Stone remains a remarkably versatile cultural symbol.

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