I think it's a Pandora's Box theme.
At 9 seconds there's a crystal thing. Red crystals are one of IRyS's visual themes all the way back to her debut MV. Then the door is chained shut. Symbolizing Hope being shut away from the world. Here's IRyS's lore:
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IRyS's lore states that she existed in the ancient age and that it's her second awakening. In retrospect and
regardless of the teaser video, her first awakening must have ended with the fable of Pandora's Box, and that seems to have been the intention from the start.
I'm betting the evil counterpart to IRyS as a vsinger, based somehow on the fable of Pandora's Box. No meds, I know I'm right.