PLEASE HELP ME FIND THIS I AM GOING CRAZY

So it's a mahwa, and the mc is aware that he is a person in a killing game, and everytime they lose the game resets over and over again. But then in his previous game, a guy who wasn't the killer ended up being the one to kill him instead. The dat repeats again and he planned to find out what happened to the other guy, it turns out that guy found a save point, thought the mc was a companion of the killer and killed him. They decide to work together, they meet the killer, and shit happens THEN in the next game somehow everyone else in the group acted very different fron the previous games. AND THAT IS WHERE I LAST ENDED READING.

I've been going crazy looking for this mahwa please help me if you know about it! Thank you!