In high school as a first year he participated in a Shikoku-wide amateur sumo tournament and in the young men's individual class he took the championship.

Though he was born in Marugame City, he chose to list Shōzu, where he went to junior and senior high school, and where he got most of his sumo experience, as his hometown.

He reached maegashira 1 in the March tournament in Osaka, and on the third day defeated Harumafuji to earn his first gold star for an upset of a yokozuna ranked wrestler.

[1] He won his last eleven matches, including wins over the ōzeki Gōeidō and Terunofuji to end with a career-best 12–3 record and the special prize for Outstanding Performance.

Kotoyūki posted five consecutive make-koshi or losing records from November 2016 to July 2017 and was demoted down to the jūryō division for the September tournament.

In 2019 he produced winning records in three straight makuuchi tournaments which took him to maegashira 3, his highest rank for over three years.

In October 2020 he had surgery for a longstanding left knee tendon injury, and the same problem forced him to miss the March 2021 tournament.

[6] Kotoyūki was a tsuki and oshi specialist, preferring pushing and thrusting techniques to fighting on the mawashi.

[7] After significant injury issues causing his demotion from the professional ranks, Kotoyūki announced his retirement in April 2021.

[9] In July 2023 it was announced that he would inherit the name Araiso from the former ōzeki Wakashimazu, who was retiring definitively after being asked to serve as a consultant as he approached his 65th birthday.

[11] Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique     Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi