Blaze Union: Story to Reach the Future (ブレイズ・ユニオン Bureizu Yunion ) is a tactical role-playing game. It was released on May 27, 2010 exclusively in Japan. Blaze Union is the prequel to Yggdra Union released for PlayStation Portable and plays using a slightly modified engine of its predecessor. It is the third game in the Union sub-series of the Dept. Heaven series.