Around that time, Kaiseki established a friendship with Yuiga Shoshun, who was a Tendai Sect Buddhist monk, and became a follower of the sect and was appointed to Chief Priest of Honko-in Temple located at Asakusa Shinbori.
この頃、天台宗の僧侶であった唯我紹舜と親交を持った介石はその門人となって浅草新堀にある本光院の住職を任されている。