NOVEL NEXT 
Oshi No Ko: Rewritten explores a what-if story, a parallel story. What-If there was someone that could've actually saved Ai, not out of pure romance throb but out of guilt and responsibility.
What if it was like the season 2 opening. Where Ai watches her children from the shadows? no longer just a ghost that haunts but as survivor that lived. Oshi no Ko: Rewritten dives deeper into a parallel ending and a deeper story development about Ai's life.
I will be uploading this too in the Royal Road website:
https://www.royalroad.com/profile/775724/fictions