Yggdra Unison - Holy Sword Legends is a spin-off of Yggdra Union released on the Nintendo DS and cellular phones. The game is a reimagining of Yggdra Union in a different gameplay format. Yggdra Unison was released exclusively in Japan. The Cellphone version was released on November 11, 2007, the DS port following two years later on December 3, 2009.