Joining the team of Tadasuke, who was a jisha-bugyo (magistrate of temples and shrines), he investigated the old documents of territory formerly owned by the Tokugawa family—such as Kai Province (Yamanashi Prefecture), Shinano Province (Nagano Prefecture), Mikawa Province, etc.—collected written materials that had been in the family's possession, and researched a book on the family's genealogy.
寺社奉行となっていた忠相の配下に加わり、甲斐国(山梨県)・信濃国(長野県)・三河国など徳川家旧領の古文書を調査し、家蔵文書を収集して由緒書を研究。