Zetsuen no Tempest

Synopsis

Yoshino learns from Mahiro that he accepted Hakaze's offer to find Aika's murderer for him in exchange for helping her stop the resurrection of the Tree of Exodus, which is being orchestrated by Samon, the man who betrayed Hakaze and ordered her exile. Upon using magic to track the culprit, they learn that somehow there are no traces leading to the perpetrator, which leads them to believe that a member of the Kusaribe Clan is responsible. As the duo wanders through the ravaged city looking for more magic talismans left behind by Hakaze, they come across Samon's aide Natsumura and, ignoring Hakaze's orders, Mahiro confronts him head on.

(Source: Wikipedia)