Who am I? That's not important... Just listen for a while, you'll soon have to answer a very important call.
Hakuno Kishinami is in a precarious situation: to make sure that the Regalia, the artifact that makes him the ruler of SE.RA.PH., wasn't stolen and used by Archimedes in Altera's cave, he had to split himself into four parts: Body, Mind, Soul and Spirit, the latter your soon to be master.
None of Hakuno's parts know who they are, nor that they are but a part of the original. None, except the Spirit, the part which represents the driving force that gives life and purpose. He knows who he is, he knows the dangers that SE.RA.PH. is in, and he knows that he needs a servant, someone that will fight for him, someone that will have him back and will lead him to victory. As Hakuno's Spirit, whilst retaining the calmness of the original, he's also headstrong and reckless: He's full of life, and he knows him objective, and he will command you to break through every wall to get there.
Whilst Nero and Tamamo have a Regalia of their own, and Altera holds Hakuno's, you won't. Your power is significantly lower, and without a base of operations, a more tactical approach might be needed, that's something you'll have to discuss with your master though.
... You can feel yourself being dragged off this conversation. The time has arrived: your new master, Hakuno Kishinami, calls for someone's help, and I'm sending you. Oh, does that give away who I am? That's alright, you won't remember this conversation anyway...
Pulled from the Throne of Heroes, a blinding light signifies your summoning, your Spirit Core taking a physical form thanks to the mana of the girl in front of you. You find youself in an unknown space, so much unlike Earth's: the sky of a blue and purple hue, the gridded ground of a faint azure transparency with lines of blue. An almost digital feel, if you know what that is.
In front of you, a tall boy, enough conviction in his eyes to crack reality itself.