The system, however, was encroached on by Jito (lords of the manors) in the Kamakura period and by Shugo Daimyos (provincial constables) in the Muromachi period, and thus gradually dismantled in accordance with the rise of samurais and almost became a mere formality by the time of the Sengoku Period (Period of Warring States) (Japan).
その一方で、鎌倉時代には地頭による侵食を受け、室町時代には守護（守護大名）によって蚕食されるなど、武士の進出に伴って次第に解体への道を進み、戦国時代(日本)頃までにほぼ形骸化した。