Crimson Eye: I Contain Strange Entities

The last subway train at midnight completely buried my life. In the carriage, I desperately deduced the monster's killing rules, trying to use my rationality to gain life. But the people around him died tragically under the rules one after another. It wasn't until I was the only one left that I finally understood: Rules have never existed for people to survive. It's just that it's not my turn to die yet.