 Hisa was the founder of the Takumakai Daitō-ryū group and was a direct student of Daitō-ryū's founder Takeda Sōkaku.Takeda Tokimune was the son of Sōkaku and inherited the leadership of the main branch of the art.Okabayashi played a pivotal role in a growing relationship between the Takumakai and Tokimune's Daitōkan group during the 1980s and 1990s.