Sentan Island exists in a state of dreamlike tranquility, surrounded by the Yuden Sea, cut off from the war between the Northern Government and the Southern Continent Free Zone.

One day the island's tranquility is shattered, when Akiyuki, along with his best friends Haru and Furuichi, are caught up in an explosion on a school bus by a mysterious pale, white haired girl named Nazuna.

As Xam'd, Akiyuki uses his newfound powers to fight off monstrous invading forces to save Haru, only to be stopped by a mysterious girl who offers him a choice: come with her and live, or stay and turn to stone.

The series received its television premiere across Japan on MBS, CBC, Tokyo MX and other Japanese broadcast networks from April 2009, featuring new opening and ending theme sequences.

[3] On June 24, 2010, Sentai Filmworks announced that it had sub-licensed the series for home video distribution across North America, where the first half season set was released on DVD and Blu-ray Disc on September 21, 2010.