Your Party
He was a member of Your Party from its foundation in 2009 to 2013. On August 7, 2013, he was demoted from the secretary-general by party leader Yoshimi Watanabe due to disagreements in political policies. He left Your Party on December 9, 2013, along with thirteen other members, and announced the formation of a new party known as the Unity Party. He stated that his goal was to "change Japan by abolishing bureaucracy-led politics, fighting vested interests and breaking the centralization of power." Your Party challenged Eda's withdrawal by ordering the resignation of the defectors.