[5] The SPJ was formed on 10 April 2010 by five Japanese lawmakers and parliamentarians, four former members of the Liberal Democratic Party (LDP) and an independent politician.

Some other proposed names had included "Nippon Kaishin Tō" (Japan reform and progress party) and "Reimei" (Dawn).

[11] Kaoru Yosano, one of the founding members, left this party on 13 January 2011[12] to join the Naoto Kan's cabinet as the minister of economic and fiscal policy.

[14] When announced by co-leaders Ishihara and Hiranuma in mid-November, 2012, The Sunrise Party incorporated all five members of the SPJ.

[17] The following day Ishihara had a meeting with Hashimoto and decided to unilaterally cancel the plans for the Genzai Nippon merger.