In these eight days, because the one of the employed fierce gods (Hachigokusotsushin, the fourth fierce god) is the inauspicious god with eight faces and eight arms, its day is made Shakkonichi and thought to be the bad luck day.
さようの日のうち、使役する鬼神の一鬼(第四番目の八嶽卒神)が八面八臂の凶神であるため、その日を赤口日とし凶日とされる。