64BitEgg
A prequel with Sou Hiyori from Your Turn to Die, before he became the Sou we know from the game.
This has Chapter 3 spoilers.
DISCLAIMER: I do not own any of the characters. They belong to Nankidai. I just made up parts of this story based on what we know from the game. (Also I do not endorse SouShin).
ANOTHER DISCLAIMER: IDK how descriptive this will get with more triggering stuff related to the Death Game so I can't guarantee that it's suitable for everyone.
(also posted on AO3)