Nippon Ishin no Kai (Japan Restoration Party) unveiled a set of policy pledges Thursday for the Upper House election next month, including a promise to push for decentralization of government power and revise the postwar Constitution.

The right-leaning party led by Osaka Mayor Toru Hashimoto and former Tokyo Gov. Shintaro Ishihara also vowed to "clarify historical facts" on the "comfort women" military brothel system and "protect the dignity and honor of Japan and the Japanese people."

In May, Hashimoto caused a major uproar by saying the comfort woman system was necessary for Japanese forces during the war. Now the party is trying to tone down the controversy for the upcoming campaign.