[1] Shoichi joined Nishonoseki stable at the age of 15 years old making his debut in the 1937 Natsu (Summer) Basho and taking the shikona or ring name of Kamikaze meaning divine wind.

At this rank he would get his first kinboshi with a win over Yokozuna Akinoumi on day 9 but would finish with just a 5–10 record sending him back down the banzuke.

Under these conditions and with a truncated tournament of only seven days that was closed to the public, Kaizan, at komusubi, could manage just a 2–5 record.

In the following Natsu Basho in 1947 at the rank of Sekiwake he would finish with a score of 7-3 including wins over Ōzeki Maedayama and Shionoumi on days 7 and 8 respectively.

Shoichi would have a fair start to his 1949 campaign posting 7-5-1 and 8-7 both at komusubi before injury would cause him to pull out midway in the Aki Basho finishing with just a 4-7-4 record.

He would come back after this in the 1950 Haru Basho putting up 9–6 record including two kinboshi from Yokozuna Azumafuji and Haguroyama on days 2 and 4 respectively.

The 1950 Natsu Basho proved to be his last, after starting with 5 straight loses he would pull out on day 6 and announce his retirement from sumo.

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