Matsumura and his family resided in a house in Kyōto, said to be extremely unlucky, and many tenants had thrown themselves into the well on the north-east side of the dwelling. But Matsumura took no notice of these tales, and was not the least afraid of evil spirits.

During the summer of that year there was a great drought in Kyōto. Though the river-beds dried up and many wells failed for want of rain, the well in Matsumura's garden was full to overflowing. The distress elsewhere, owing to want of water, forced many poor people to beg for it, and for all their drawing the water in this particular well did not diminish.

One day, however, a dead body was found lying in the well, that of a servant who had come to fetch water. In his case suicide was out of the question, and it seemed impossible that he should have accidentally fallen in. When Matsumura heard of the fatality he went to inspect the well. To his surprise the water stirred with a strange rocking movement. When the motion lessened he saw reflected in the clear water the form of a fair young woman. She was touching her lips with beni. At length she smiled upon him. It was a strange smile that made Matsumura feel dizzy, a smile that blotted out everything else save the beautiful woman's face. He felt an almost irresistible desire to fling himself into the water in order that he might reach and hold this enchanting woman. He struggled against this strange feeling, however, and was able after a while to enter the house, where he gave orders that a fence should be built round the well, and that from thenceforth no one, on any pretext whatever, should draw water there.

Shortly afterwards the drought came to an end. For three days and nights there was a continuous downpour of rain, and the city shook with an earthquake. On the third night of the storm there was a loud knocking at Matsumura's door. The priest himself inquired who his visitor might be. He half opened the door, and saw once more the woman he had seen in the well. He refused her admission, and asked why she had been guilty of taking the lives of so many harmless and innocent people.

Thus the woman made answer: "Alas! good priest, I have never desired to lure human beings to their death. It is the Poison Dragon, who lived in that well, who forced me against my will to entice people to death. But now the Gods have compelled the Poison Dragon to live elsewhere, so that to-night I was able to leave my place of captivity. Now there is but little water in the well, and if you will search there you will find my body. Take care of it for me, and I shall not fail to reward your goodness." With these words she vanished as suddenly as she had appeared.

Next day well-cleaners searched the well, and discovered some ancient hair ornaments and an old metal mirror.

Matsumura, being a wise man, took the mirror and cleaned it, believing that it might reveal a solution to the mystery.

Upon the back of the mirror he discovered several characters. Many of the ideographs were too blurred to be legible, but he managed to make out "third month, the third day." In ancient time the third month used to be called Yayoi, or Month of Increase, and remembering that the woman had called herself Yayoi, Matsumura realised that he had probably received a visit from the Soul of the Mirror.

Matsumura took every care of the mirror. He ordered it to be resilvered and polished, and when this had been done he laid it in a box specially made for it, and mirror and box were placed in a particular room in the house.