Zetsuen no Tempest

is a Japanese manga series written by Kyō Shirodaira and illustrated by Arihide Sano and Ren Saizaki. An anime adaptation by Bones aired from October 2012 to March 2013. It has been licensed by Aniplex of America in North America and by Madman Entertainment in Australia.

Plot
The story revolves around Mahiro Fuwa, a teenager whose family was mysteriously murdered one year before and his friend Yoshino Takigawa. Mahiro is contacted by Hakase Kusaribe, the leader of the Kusaribe clan who was left stranded on an unknown desert island by her followers, and agrees to help Hakase in exchange of her help to find out the culprit for the death of his family. Upon learining of his friend's intentions, Yoshino joins him on his quest to stand against the Kusaribe clan who intends to awake the "Tree of Zetsuen" whose power can bring ruin to the entire world.

Official
Official Site (Japanese)