Originally posted by: Ryllharu
I suspect Diva actually resembles Saya. There was that brief flash in this eps where they showed another girl with long hair on a blue backgroud. It looked a lot like Saya when she came out of the tomb, but it was definitely not her.

Diva sings, and its name is "diva." That's my thought progression anyway.
like a counter part? interesting theory.