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Born in Echigo, Toshiaki went to Edo to study astronomy, mathematics and kendo. At the age of 24, he opened his own school. He wrote A Secret Plan of Government (Keisei Hisaku; 経世秘策), in which he proposed lifting a ban of a foreign trade and colonization of Ezo, and Tales of the West (Seiiki Monogatari; 西域物語), both in 1798.
- Excerpts of both can be found in the book by Donald Keene.