She's definitely not Sosul.
Read back Part 1, there was a scene where the new girl among a few was introduced by Striped Suit Slint Eyes to Shiion while Shiion was still bed-ridden and roughly unconscious.
So yeah, it's almost definitely confirmed that she's some form of bodyguard assigned by the Slint Eyed guy.
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Night~and~Gale: ~ The Final Mythology of the Man who Defied Destiny.
The sleeping lion shall awaken beyond the depths of time, crossing ten billion lights, come to Terra.
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