Yūki Akitomo served as a bushi during the Sengoku period.
Akitomo was born as the son of Yūki Masakatsu, the sixteenth head of the Yūki clan of Shimōsa Province.
There is a theory that he died on 3/24 of Tenbun 17 (1548), and, under another theory, on 8/2 of Eiroku 2 (1559). Under the former, Akitomo inherited the headship of the clan upon his father’s retirement and, under the latter theory, upon his father’s demise.
In any event, Akitomo was said to have died from smallpox just one day after succeeding his father. Subsequently, the headship of the Yūki clan was inherited by Akitomo’s younger cousin, Yūki Harutomo, who was earlier adopted by Masakatsu. Harutomo was the third son of Masakatsu’s younger brother, Oyama Takatomo.
Owing to the fact that Akitomo died just one day after succession, he is not counted among the generational heads of the Yūki, with the sixteenth head being Masakatsu and the seventeenth head being Harutomo.