Sunrise Party
On April 4, 2010, Yosano, Takeo Hiranuma, Hiroyuki Sonoda, Takao Fujii and Yoshio Nakagawa announced their plans to leave the LDP to establish a new political party, the Sunrise Party of Japan. He left the Sunrise Party on 13 January 2011 to join the Naoto Kan's cabinet as Minister of Economic and Fiscal Policy.