Oshio was a kensai master in Kozakura in 1357 DR.
Oshio lived and managed his school in Tamanokuni, housed and sponsored by Yukio, a rice merchant. One of his students was Yukio's son.
- ↑ 1.0 1.1 David Cook (1986). Swords of the Daimyo (Province Book of Miyama). (TSR, Inc), p. 19. ISBN 0-88038-273-2.