He first entered the top makuuchi division in 1991 and made his sanyaku debut in March 1993 from komusubi rank.
He then signed with K-1, a kickboxing and mixed martial arts organization, fighting under his old shikona (He uses the Latin script, appearing as "WAKASHOYO" rather than using the Japanese characters.
He made his debut in a kickboxing bout against fellow newcomer, South Korean giant Choi Hong-man in the quarter-final of the K-1 World Grand Prix 2005 in Seoul on 19 March 2005.
Wakashoyo returned to the promotion against Kazuhiro Hamanaka at Hero's 5 on 3 May 2006 and was submitted with an arm lock.
Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi