He refuted the conventional evidences used in order to support the runaway story of the Ako Roshi (lordless samurai of Ako Domain) Nobuyuki TERASAKA, and in turn, he presented some historical materials to testify Terasaka's participation in the raid.
それまであった赤穂浪士寺坂信行逃亡説の証拠を論破し、逆に彼が討入に参加した証となる史料を提示した。