In Edo bakufu (Japanese feudal government headed by a shogun), under the supervision of a wakadoshiyori (a managerial position within the Edo government), Kosho took care of the personal chores of the Seii Taishogun (literally, 'great general who subdues barbarians').
江戸幕府では若年寄の支配下で、征夷大将軍の身辺の雑用を務めた。