First formed in 1980 by Kazuyoshi Ishii, a former Kyokushin Karate practitioner who began his training under Hideyuki Ashihara in 1969.
Soeno practiced with the senior pupils who were Shigeru Ōyama, Yasuhiko Ōyama (both from The World Ōyama Karate in the United States - Shigeru is Sōshu and Yasuhiko is Saikō Shihan), Tadashi Nakamura and Hideyuki Ashihara at the time.