Somehow…I always suspected, but I never could make any sense of the theory. There was no way the Mage of Exodus could be a no-name like Hanemura…so it could only be her. Is it really true? Did she die in order to force that entire debacle with Samon? Does it really go so far back? Because her death is what caused Mahiro and Yoshino to oppose the Tree of Exodus, which would eventually cause them to turn against the Tree of Genesis once its power was unleashed.
You can’t tell me that everything up until now was furthering the goals of the Tree of Exodus. Now there are only two possible culprits for Aika’s murderer…Hakaze and herself. But if you really think about it, Mahiro won’t accept some excuse from Hakaze that she killed her because she was the Mage of Exodus…so she can’t have done it…right? That ending makes no sense…it had to have been either Aika or the Tree of Exodus’s will.