After two years of purification in Shosaiin (the residence of Saiin in the Imperial Court), the Saiin Priestess entered into Honin (the official residence of Saiin) located in Murasakino on the north side of Heian kyo early in April during the third year of her term. (According to Bunei TSUNODA's theory, the original site of the residence of Saiin was located near present-day Ichiitani nanano yashiro in Kamigyo Ward, Kyoto City.)
宮中初斎院での2年の潔斎の後、3年目の4月上旬に平安京北辺の紫野に置かれた本院（斎院御所）に参入する（角田文衞説では、斎院御所のあった場所は現在の京都市上京区櫟谷七野社のあたりに相当するという）。