He worked his way quickly through the lowest three divisions, making his makushita debut shortly after his 18th birthday, less than three years into his career.
Kōbō remained with the Japan Sumo Association as an elder under the name Ajigawa-oyakata, and initially worked as a coach at his old stable.
In July 2015, with Wakanosato likely to retire, he switched to the Otowayama name formerly owned by the late Takanonami and subsequently controlled by Takanohana Oyakata.
He left the Sumo Association in January 2018 after the Otowayama kabu was needed by ex-maegashira Daido (formerly Onogawa Oyakata).
Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi