On the basis of the handwriting we can say that the sayagaki was done by Katsuhime herself and further that it dates about to the time when their under-age heir was entrusted to her after Tadanao was banned to Hagiwara (萩原) in Bungo province due to a faux pas in Genna nine (元和, 1623). This heir was the already mentioned Matsudaira Mitsunaga, the employer of the swordsmith Ōmura Kaboku. It is recorded that the young Mitsunaga woke up every night crying, plagued with nightmares. The doctor of the fief diagnosed the so-called disease „kan no mushi“ (疳の虫)* but neither medication, nor therapies or even prayers or lucky charms helped. One of the servants suggested to lay the dōjigiri to the side of Mitsunaga´s cushion during the nighttime. This was first brushed aside but later it was clinged even to the most absurd ideas.

*Kan no mushi are nervous problems at children which are said to be caused by parasites (mushi, 虫). The symptoms are as at Mitsunaga nightly crying fits.

But from the night the sword was layed close to the cushion of Mitsunaga, the nightly crying fits stopped immediately. This story spread fast and soon the people believed that the dōjigiri was possessed by a fox ghost, a then „well-known“ phenomenon which was called (kitsune-tsuki, 狐憑き).