A version of Shiroko who remains the sole survivor of Abydos High School, exposed to Chroma by the Nameless Priests, which also altered her physical appearance. Shiroko would go on to serve the Nameless Priests directly under the protection of Phrenapates, until the main timeline's Sensei infiltrated the Ark of Atrahasis, leading to its subsequent destruction. In Volume 1 Chapter 3, Shiroko was summoned by Plana to assist in subduing Hoshino Terror, whose mental state began to spiral similarly to hers.

As of the end of Volume 1 Chapter 3, Shiroko has now been appointed as a member of the General Student Council, and her Halo has slowly begun to heal, now that she's since let go of the guilt of losing her friends.