At the edge of the earlier connections that Kodo KAIJOIN of Saisho-ji Temple who was a disciple of the second head, Joshin, spread tea ceremony in Akita, Soshin visited Akita four times to involve in the promotion and the school has known over the Tohoku region, especially in Akita since then.
もともと2代杖信の弟子で西勝寺の皆乗院公道が秋田に茶道を普及していた縁があり、宗震は4回にわたって秋田を訪れ伝道に携わり、それ以来秋田を中心に東北地方に広まっている。