Kurozuka
Legend of the onibaba buried at Kurozuka in Adachigahara.
Kurozuka (黒塚), meaning "black mound," refers to both a burial site and the legend of an onibaba located in Nihonmatsu, Fukushima Prefecture (formerly part of Oodaira in Adachi District). This onibaba is said to dwell in Adachigahara, the area along the eastern bank of the Abukuma River and the eastern foothills of Mount Adatara, and is commonly known as the "Onibaba of Adachigahara." Originally, Kurozuka was simply the name of the mound where the onibaba was buried, but over time it has also come to refer to the onibaba itself. The legend inspired several traditional performances, including the Noh play *Kurozuka*, the nagauta and kabuki piece *Adachigahara*, and the kabuki jōruri *Ōshū Adachigahara*.
According to the *Ōshū Adachigahara Kurozuka Engi*, a text published by the temple Mayumisan Kanze-ji near Adachigahara, the story unfolds as follows. In the year 726 (a fire tiger year in the Jinki era), a monk named Tōkōbō Yūkei from Kii Province was traveling through Adachigahara as dusk fell. He asked to stay overnight in a cave, where an old woman lived. She kindly let him in but then left to gather firewood, warning him not to look further into the room. Curiosity got the better of Yūkei, and when he opened a shutter, he saw a pile of human bones. Realizing this matched rumors of an onibaba that killed and devoured travelers, he fled. The old woman returned, transformed into a terrifying onibaba, and gave chase. As she closed in, Yūkei pulled out a statue of Nyoirin Kan'non Bosatsu (a form of Guanyin) and chanted a sutra. The statue rose into the sky, became a shining white bow with a vajra arrow, and struck down the onibaba. Though slain, the onibaba found peace through the Buddha's guidance. Yūkei buried her near the Abukuma River, and the site became known as Kurozuka. The Guanyin statue, later called Shiromayumi Kan'non ("pure white arrow Guanyin"), was deeply venerated. Notably, while the legend places the event in the early Nara Period, Yūkei was a real historical figure from the Heian Period, recorded in works like the *Edo meisho zue* as "Tōkōbō Ajari Yūkei."
- field
- Japanese folklore / legend
- nationality
- Japanese
- known_for
- Onibaba (demon hag) of Adachigahara; subject of noh, kabuki, and jōruri plays
- associated_location
- Adachigahara, Fukushima Prefecture
Lore & Background
According to the Ōshū Adachigahara Kurozuka Engi published by the temple Mayumisan Kanze-ji near Adachigahara, the legend is told as follows. In the year 726 (a year of fire tiger in Jinki), a monk from Kii Province, Tōkōbō Yūkei, journeyed in Adachigahara as the sun was about to set and requested lodging in a cave. An old lady lived there. She kindly let him in but then left, telling him not to look further into the room. Yūkei opened the shutter out of curiosity and saw a mountain of human bones. Recalling rumors of an onibaba who killed travelers and devoured their blood and meat, he fled. The old lady returned, transformed into a fearsome onibaba, and gave chase. Yūkei took out his statue of Nyoirin Kan'non Bosatsu and chanted a sutra; the statue danced into the sky, forming a shining demon-slaying pure white bow and
Reader's Guide
Kurozuka represents a key figure in Japanese folklore: the onibaba (demon hag) of Adachigahara. The legend, recorded in the Ōshū Adachigahara Kurozuka Engi, centers on a monk who encounters a seemingly kind old woman who is actually a man-eating demon. The story's themes of deception, curiosity, and Buddhist salvation have made it enduring. It inspired multiple classical performing arts: the noh play Kurozuka, the nagauta and kabuki performance Adachigahara, and the kabuki jōruri Ōshū Adachigahara. Variations exist: in some versions the onibaba is killed by a thunderous roar or lightning from the Guanyin statue; in others she is reformed; in yet others Yūkei loses her at dawn. A separate legend claims Yūkei came to Adachigahara specifically to exorcise the onibaba, chased her north, and eventually slew her; her head was stored in a temple (later abandoned) and her body buried at a hill in Oyama, where a cherry tree was planted. The origin of the onibaba is disputed. One tale says she was a nurse named Iwate who, seeking a fetal liver to cure a princess, unknowingly killed her own daughter and went mad. Another from Aomori Prefecture tells of a warrior's wife named Iwa who, after her husband's death, killed a pregnant traveler who turned out to be her own daughter. The article notes these origin stories contain historical contradictions and are likely later fabrications.
Did You Know?
- The Kurozuka is both the name of the mound where the onibaba is buried and a term for the onibaba herself.
- The monk Tōkōbō Yūkei, though placed in the Jinki era (726), was a historical figure of the Heian Period who died in 1163.
- The onibaba's origin story involving a nurse named Iwate contains contradictions, as the Jinki era predates the Heian capital where she supposedly served.
- In Aomori Prefecture, a place called Asamizu is said to be where the onibaba washed her knife after killing, and the name may mean 'don't see morning.'
Frequently Asked Questions
Who is Kurozuka?
Kurozuka is the name given to a legendary onibaba (demon hag) tied to the Adachigahara region in Fukushima Prefecture. The term originally identified only the burial mound, but over generations it became a shorthand for the hag herself. She is one of the most recognizable onibaba figures in Japanese supernatural folklore.
What does the name Kurozuka mean?
Kurozuka (黒塚) translates literally as "black mound" in Japanese. It was first used to designate the specific hill where the onibaba was interred in the Adachigahara area. As the legend spread, the name shifted from describing a physical location to naming the demon hag directly.
Where is Kurozuka from?
The legend is anchored in the Adachigahara stretch running along the eastern bank of the Abukuma River and the foothills of Mount Adatara. Geographically this corresponds to present-day Nihonmatsu in Fukushima Prefecture, historically part of Oodaira in Adachi District. The hag's domain in the story is this riverside and hillside landscape.
How does Kurozuka's story end?
The narrative concludes with the onibaba being buried at the very mound that gives the tale its name. Rather than a dramatic slaying, the hag's final fate is interment at the site now called Kurozuka. This burial is the defining closing act of the legend.
Why is Kurozuka important in Japanese folklore?
Kurozuka exemplifies the onibaba archetype and serves as a focal point for the regional supernatural traditions of the Adachigahara area. The legend has been adapted across multiple classical performance forms, appearing in noh, kabuki, and jōruri theater. Her story keeps the local folklore of Fukushima alive within the broader Japanese cultural canon.
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