Wrestling for Takadagawa stable, he made his professional debut in March 2014, and became sekitori when he reached the jūryō division in January 2023.

[4] His motivation to join sumo came from visiting Takadagawa stable when he was in junior high school in Ōiso, Kanagawa.

Because of his physique, his stable had high hopes for him although Shōnannoumi suffered from the wall of the upper makushita ranks for a long time.

[11] During the party celebrating his promotion, former Japanese Prime Minister Yoshirō Mori, a patron of his stable, declared 'I knew this man would become someone.

[12] He initially chose a dark pink shimekomi for his first tournament because it's the colour of the Saikijin Clinic in Hiroshima who offered him the mawashi,[3] and because he considers that color is his lucky charm.

[14] After only three tournaments in jūryō, Shōnannoumi was officially promoted to the top makuuchi division in July 2023 with the rank of west maegashira 14.

[17] Shōnannoumi was a contender for the top-division championship during the May 2024 tournament,[18] taking the sole lead on Day 11 at the rank of maegashira 10 with only 2 losses before falling out of the title race.

[5] Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique     Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi Terunofuji (retired) Kotozakura Hōshōryū Ōnosato Wakamotoharu Daieishō Abi Wakatakakage Takanoshō Kirishima Tobizaru Atamifuji Gōnoyama Ōhō Shōdai Ura Hiradoumi Chiyoshōma Takayasu Ichiyamamoto Endō Mitakeumi Rōga Takarafuji Churanoumi Ōshōma Tamawashi Meisei Midorifuji Takerufuji Nishikigi Ōnokatsu Shōnannoumi Kotoshōhō Hokutofuji Kinbōzan Hakuōhō Kitanowaka Tamashōhō Kagayaki Nishikifuji Tokihayate