The series is frequently discussed in community forums like Reddit for its heavy use of "NTR" (cuckoldry) tropes, graphic content, and the psychological "breaking" of its characters.
: The psychological thriller by Kawamitsu Shinichi, which is significantly behind that chapter count. If you are looking for Chapter 208 of the manhwa "Circles"
Unlike standard survival games where the danger is a physical enemy, Guilty Circle often utilizes a mechanic where the danger is a specific zone or a rule-set that forces inaction or specific movement.