Hanshi, Daigo Oishi is the President of the So-Kyokushin Organization.
- He became a pupil of Kyokushin Kaikan So honbu in 1960.
- He won 3rd place in the 3rd Japan Tournament, 4th place in the 6th All Japan Tournament, and 4th place in the memorable 1st World Tournament.
- Because of his excellent record, he became Sosai’s Uchideshi and was given masterful instruction for 5 years.
- Sosai Oyama referred to Oishi Shihan’s footwork as “Yoto Muramasa” after the famous sword, as his technique had a sharpness and deadly force reminded Sosai Oyama of the famous weapon.
- He was also acclaimed as the “genius of kick work” by Sosai Oyama.
- He established the Yamanashi branch in 1976.
- He also established the Shizuoka branch in 1977.
- He is complete 50 man Kumite in 1990 ( Goju Nin Kumite )
- He is Complete 70 man Kumite in 1998 ( Nanaju Nin Kumite )
- He has always been on the front lines.
