This is the Shiroko from the other timeline and was given her powers from the Chroma's exposure, and by the Nameless Priests. Shiroko herself then battled along her way into the Atrahasis and managed to get the ancient technology to warp into the present timeline. She was rescued by Sensei during the events of the Final Volume as Sensei used the last Escape Sequence just for her, and alongside of the Volume 1's end, she was called by the powers of what remains of the Chroma to battle Hoshino, who is in the "Terror" state.

As of her release, her Halo is repairing and glowing and all of the guilt and sorrow has been disappeared. She is also promoted to be a member of the Student Council.