Seiryo Shinjo (formerly called Seizan Shinjo) was born on Ie-Jima Island, June 10, 1908. His father, Seisan Shinjo, was a well-known bo expert on Ie-jima.
Seiryo traveled to Wakayama seeking employment in 1923, one year before Kanbun Uechi. Seiryo found a job with the same company that Kanbun later would, the Himomaru Sangyo Kabushki Kaisha, a boseki factory. He eventually heard stories of Kanbun and that he was now teaching.
Seiryo Shinjo entered the Shataku dojo of Kanbun Uechi early in 1927. He and his wife Tsuru, whom he had met in Wakayama, were married later the same year.
Seiryo Shino was a small agile man who became known for his incredibly fast kicks. Hisaguwa Seizen (fast kicker Seizen) was the nickname given to him by his peers. Seiryo was a quiet, gentle man who would not quarrel with anyone. Kanbun grew to like him very much and they became the best of friends. Kanbun felt comfortable with Seiryo and Tsuru. Their house was the only place he could relax and express himself. It became a gathering place for Seiryo’s friends including Kanbun, who was present for the birth of their daughter, Sayako.