Before Genroku Ako Incident, Sohen frequently attended the tea ceremony at Kira's residence at the invitation of Kozukenosuke KIRA, who was also the pupil of SEN no Sotan, because the residence of Kozukenosuke was transferred to Honjo.
元禄赤穂事件の際には、吉良上野介（上野介も千宗旦の弟子の一人だった）が本所に屋敷替えになった後にはしばしば吉良邸の茶会に招かれて出席している。