A boy whose family was killed one year before the series' start, including his father, mother and step-sister Aika. In exchange for help to find the culprit behind the murder, Mahiro agrees with Hakaze's plan to stop the resurrection of the Tree of Exodus with Yoshino's help. With little care for the destiny of the world, Mahiro's only desire is to locate and kill the murderer of his family, especially for Aika's sake. Though he is not related to Aika by blood, Mahiro claims he never had any romantic feelings for her, even if his actions imply otherwise.
Mahiro's setup and behavior includes allusions to Prince Hamlet, as just like the main character from Shakespeare's tragedy Hamlet, he is prone to abandon all morals and reason for the sake of exacting his revenge. It also includes allusions to Laertes, the brother of Hamlet's beloved Ophelia who also seeks revenge for the deaths of his father and sister.