In 1784, at 51 years of age, he wrote a draft of 'Kanno Wano Nano Kokuo Kinin ko (A Study of the Golden Seal of the King of Japan, Chinese Colony),' and in 1785 he wrote a draft of 'Kaseiden' (a study of Manyo shu (Collection of Ten Thousand Leaves)).
1784年（天明4年）51歳、「漢委奴国王金印考」（考証）、1785年、「歌聖伝」（万葉集研究）稿。