Zetsuen no Tempest

http://www.gogoanime.com/zetsuen-no-tempest-episode-1

Zetsuen no Tempest is influenced by Shakespeare's plays. 

It isn't in a poetic form, but it does follow the plot to an extent. This gives it a very nice edge in the plot.

This anime is one of the most confusing that I've ever watched. You will probably not be able to predict what will happen next.

Inspired by the works of William Shakespeare, especially his play The Tempest, Zetsuen no Tempest is a tragic tale that explores the balance of sanity and madness, sense and intelligence, and self-confidence and convictions. 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 Hakaze Kusaribe, the leader of theKusaribe Clan who was left stranded on an unknown deserted island by her followers, and he agrees to help Hakaze in exchange for her help to find out the culprit for the death of his family. Upon learning of his friend's intentions, Yoshino joins him on his quest to stand against Samon Kusaribe, who intends to awaken the Tree of Zetsuen whose power can bring ruin to the entire world.

I give this anime a 10/10.