Japanese sumo wrestler
 was a Japanese professional sumo wrestler from Tsuna, Hyōgo Prefecture (now Awaji, Hyōgo). His highest rank was "ōzeki". He is the second wrestler from Hyōgo Prefecture to have reached this rank, being the first promoted since Iwamigata's promotion in 1821, 69 years earlier.
History.
Little is known about Ōzora before he became a professional wrestler. He first tried his luck by becoming a wrestler with the Osaka-based Sumo Association and joined Onogawa stable under the instructions of Hachijin, the first "yokozuna" from Osaka-sumo promoted by the Gojō family of Kyoto. There, he first took the "shikona", or ring name, .
Eventually he decided to leave Osaka to become a wrestler with the Tokyo-based Sumo Association in January 1879, and joined Ikazuchi stable led by Umegatani, who was still an active wrestler at the rank of "ōzeki". He was quickly promoted to the "makuuchi" division, just one year after joining the stable. After his first promotion to the rank of "sekiwake", he changed his "shikona" to , to evoke the whirlpools of his native island, which also gave the name "Ōnaruto" to the bridge that now crosses the Naruto Strait. Ōnaruto later changed his wrestler's first name to "Nadaemon" to evoke the eponymous wrestler of the Edo era. Ōnaruto enjoyed a stable career but failed to break through to the top of the "san'yaku" ranks. During his years at Ikazuchi, he became known as one of the most skilled wrestlers trained by Umegatani, with Tomonohira and Tsurugizan.
In 1885, he separated from his master by acquiring the name Hakkaku, deciding to open his own stable while continuing to wrestle under the name of Ōnaruto, under the two licenses system.
In 1890, Konishiki was promoted to "ōzeki" and Ōnaruto was promoted to the same rank as him, directly from the rank of "komusubi". This promotion came at a time when the ranking was becoming unbalanced, since Nishinoumi had received a "yokozuna" licence that same year from the Yoshida family. Nishinoumi also demanded that he be ranked above the "ōzeki" on the ranking, and thereby imposed the term "yokozuna" on the "banzuke". It was then decided that Ōnaruto, as a reward for his many years of service in the "san'yaku" ranks, should be promoted in order to have a second "ōzeki" on the "banzuke". Nevertheless, Ōnaruto, at the age of 37, failed to live up to the rank, recording only one tournament at this rank and deciding not to participate in a second before retiring as a wrestler. After the latter, he dedicated himself to organising his stable. As a coach, he raised "sekiwake" Ōnaruto III, who took his "shikona" and succeeded him as stablemaster in Hakkaku stable. He died at the age of 54 on 15 January 1908.
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