In the Cthulhu Game, Others Lose Sanity, but I Gain Wisdom.

A game called "The Abyss" has arrived, and humans around the world have been forcibly drawn into it. There is no escape key. No archive. To die is to really die. There are monsters here that are so terrifying that they can drive you crazy, there are whispers of ancient gods that will cause you to lose your sanity upon sight, and there are wilderness areas where resources are so scarce that you have to risk your life for even a sip of clean water. Players betray each other and kill each other just to survive one more day. Lu Ci, a social creature with a vicious tongue who has no friends, was also brought in. When others saw the squirming tentacles and dense eyes, their senses went crazy and they screamed and collapsed. Lu Ci's first reaction was—— "You have so many eyes, are you short-sighted? You didn't even see me when you opened them so many times." "This tentacle looks like it's cramped. Can you go to an orthopedic surgeon first?" Then he discovered an outrageous fact: the more fearful others became, the more crazy they became, while the more fearful he became, the more sane he became. Whenever his sanity drops to the edge of collapse, he will enter a state of "absolute rationality" and can see through the weaknesses of monsters, loopholes in the rules, and every teammate with ulterior motives. As a result, in this abyss where everyone was struggling to survive in fear, Lu Ci became the only one who survived by "arguing." The aloof female player Su Wan is one of the first people in this game to adapt to the rules. She looked down on Lu Ci's bad mouth, but she had to admit that following this mean-mouthed social beast would have the highest survival rate. "Can you shut up." "No. If I shut up, my sanity will drop. Are you responsible?" "... Then you say." Until one day, Lu Ci complained about something he shouldn't. That thing also heard it.