Kasugano stable
Masuiyama remained in the sumo world as an elder initially under the name Onogawa, and in November 1984 he succeeded his father as head coach of Mihogaseki stable, when the latter reached the retirement age of 65. His father died in 1986. He inherited "ōzeki" Hokuten'yū, and produced four other top division wrestlers: Higonoumi, Hamanoshima, Baruto and Aran. Known as Mihogaseki Oyakata, he ran the stable until October 2013, when he dissolved the stable and moved his wrestlers to Kasugano stable. He was also formerly on the board of directors of the Japan Sumo Association. He reached the Sumo Association's mandatory retirement age of 65 in November 2013.