Masamichi was received in audience by Shogun Ienari for the first time in 1800 and began his service in 1808. He rose to the post of Hyobu Shoyu (high post in the department of army) and to the title of Iga-no-kami.
He was appointed magistrate of Osaka (1829), conducted riparian work on rivers in Settsu and Kawachi provinces (Osaka Prefecture) and enlarged the estuary of the Yodo River of Osaka. His administration was extolled by Osaka townsmen, who dedicated Tempozan Hill as a memorial for Masamichi. He was discharged after being unsuccessful in carrying out an administrative reform.
He was a lover of literature, he had a large library. Wrote essays and poetry.