Ushi-no-Toki-Mairi (Japanese: 丑の時参り, lit. "ox-hour shrine-visit") or ushi no koku mairi (丑の刻参り) refers to a prescribed method of laying a curse upon a target that is traditional to Japan, so-called because it is conducted during the hours of the Ox (between 1 and 3 AM). The practitioner—typically a scorned woman—while dressed in white and crowning herself with an iron ring set with three lit candles upright, hammers nails into a sacred tree (神木, shinboku) of the Shinto shrine. In the modern-day common conception, the nails are driven through a straw effigy of the victim, impaled upon the tree behind it. The ritual must be repeated seven days running, after which the curse is believed to succeed, causing death to the target,[6] but being witnessed in the act is thought to nullify the spell.The Kifune Shrine in Kyoto is famously associated with the ritual.

-wikipedia

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