In a tale told in the Uji Shūi Monogatari, an early-thirteenth-century collection, and in a parallel version in the older Konjaku Monogatari-shū, a young official dies because he answered a knock at his door. He did not open the gate. He did not break the obvious terms of his ritual seclusion. He came to a side door, showed his face through a gap in the wood, and spoke — and that was sufficient. The curse travelled on the sound of his own voice.
What keeps me with this story is not the supernatural element. Japanese folklore has no shortage of curses. It is the mundanity of the mistake. He was polite, and the politeness killed him.
English-language retellings of this tale, including the one in ONMYOJI, add some elaboration to make the context legible. The account below keeps to what the old text says, and says so where it is silent.[1][2]
A gifted young scholar of calculation at the Heian court. A rival of similar background and lesser talent. A curse-worker operating in the ruins of the old capital, outside any sanction. And a period of ritual seclusion meant to protect the official, which instead supplied the opening.
This is a story about how envy, ambition, and one act of social courtesy combined to end a promising life in Heian-period Japan.
The narrative centers on a young man of the Ozuki clan, the court’s hereditary specialists in calculation. His father had been head of the Bureau of Accounts; the son, named Mochisuke in the text, held the post of Doctor of Calculation and was spoken of as the ablest of his line.[1]
The success bred resentment. A rival of similar background and lesser ability grew consumed by jealousy, and the texts suggest he concluded that the only route to his own advancement was to remove the competition entirely.
When an ill omen visited Mochisuke’s household — accounts vary on its nature, though strange phenomena involving fire are mentioned — he consulted a diviner, who prescribed strict monoimi, ritual seclusion lasting several days. Mochisuke was to seal his gates, avoid all contact with the outside world, and, above all, neither speak to outsiders nor show his face to anyone beyond his household.
The rival learned of the seclusion by means the text does not disclose. He then sought out a practitioner of forbidden arts — not a court onmyōji but someone working outside sanctioned channels. The curse-worker set his terms: to direct a fatal curse he needed to hear the target’s voice and to see his face. The rival proceeded.
During the seclusion the rival came to Mochisuke’s gate, the curse-worker hidden nearby. He knocked and claimed urgent business. When the servants refused to open, he asked only that Mochisuke come to a small side door and speak through the slats.
Mochisuke hesitated. He remembered the diviner’s warning. He also considered that refusing a colleague outright might look rude, and that speaking through a closed door was not, technically, the same as opening it.
He showed his face. He spoke.
From that hour his head began to ache. On the third day he died.[1]
The text does not let the matter end there, though it is careful about how it knows. It reports, as something heard, that the man who bought the curse met with calamity himself not long after and died, as though the thing had come back onto his own body. Of the curse-worker’s fate it says nothing.[1]
The mathematics connection. The victim was not simply a bureaucrat. He was a scholar of calculation, and in Heian court life calculation sat close to the esoteric arts. Arithmetic specialists frequently held concurrent appointments as court astronomers or as onmyōji, practitioners of the yin-yang arts.
Abe no Seimei himself held a post in the Bureau of Accounts late in his career, and Kamo no Yasunori, his senior in onmyōdō, headed the same bureau. There is a real possibility, then, that Mochisuke was not only a talented clerk but a promising practitioner of the esoteric arts. Read that way the story changes shape: an unlicensed curse-worker eliminating a rival professional before he could fully develop. A trade killing dressed as a cautionary tale about ritual observance.
The economy of medieval motivation. Characters in these narratives do not agonize. The rival spends no sleepless nights on his conscience and never asks whether murder is justified. He sees an obstacle and removes it. The psychology is nearly transactional — not poor characterization but a different understanding of how motive works in a story. The old text trusts its readers to accept that jealousy is sufficient cause, and offers nothing further.
Why the curse-worker agreed. The original text is silent on this. Payment, perhaps. Professional pride. Or the wish to test himself against someone who might one day have become a formidable onmyōji. The silence is deliberate; classical Japanese aesthetics often prefer a suggestive gap to a complete explanation.
The victim made no dramatic error. He did not ignore a clear warning or assume himself invulnerable. He made a small, reasonable-seeming compromise: he was polite where he should have been rude, and visible where he should have stayed out of sight.
How often does anyone decide that something is not, technically, quite breaking the rule?
The Heian aristocracy believed invisible forces moved through the world looking for a way into human lives. They were probably wrong about the mechanics. The observation underneath has held up better: a boundary you are willing to breach yourself, even slightly, even once, is not a boundary.
The curse finds the crack. It always finds the crack. That is why the story is still worth telling, a thousand years on.
The readings in “Points of interest” and “A final thought” are KWAIDANOTE’s own.
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