庚申待

こうしんまちkoushinmachi

noun

1. kōshin-machi
2. staying awake on the eve of the 57th day of the sexagenary cycle to prevent the three worms that were said to inhabit the human gut from reporting one's wrongdoings to the gods; a tradition that began among nobility in the Heian period and became widespread during the Edo period

Study it in Yanamino