In 1686, under the command of Tsunayoshi TOKUGAWA who was the 5th Seii Taishogun (literally, the great general who subdues the barbarians), Ryuko became Jushoku (a head priest) of Chisoku-in Temple of Mt. Tsukuba which was in charge of incantation and prayer for the shogun's family, thereby rapidly winning devotion from Tsunayoshi.
1686年（貞享3年）5代征夷大将軍徳川綱吉の命により将軍家の祈祷寺である筑波山知足院の住職となったの機に、急速に綱吉の帰依を得た。