The Koyosha was an isolationist secret society in Meiji Restoration-era Japan. By 1867, rumors abounded in the Choshu Domain about the rise of the Koyosha, a secret society dedicated to isolationism and the feudal samurai way. In spite of the outbreak of relatively frequent samurai rebellions across the Choshu Domain's occupied lands as backlash against modernization, the Koyosha were no cause for great concern, never launching a rebellion of their own.