In 1678, he celebrated his genpuku (formal recognition of adulthood) at the age of 20 and changed his name to Gonnojo, and assisted goshomotsuyaku (official in charge of the domain lord's library) as osobayaku (attendant page).
延宝6年（1678年）20歳に元服して権之丞と改名、御傍役として御書物役手伝に従事する。