In the Osaka conference held from January to February in 1875, Toshimichi OKUBO and Hirobumi ITO who were working for the Meiji Government reached an agreement with Takayoshi KIDO, Taisuke ITAGAKI, and Kaoru INOUE who were out of power, and it promised the return to the govenment for Kido and Itagak and the reform in political system.
1875年（明治8年）1月から2月にかけての大阪会議において、明治政府の大久保利通・伊藤博文と、在野の木戸孝允・板垣退助・井上馨らとの間で合意が成立し、木戸・板垣の政府復帰と政治体制の改革が約束された。