This walkthrough is for Zero Escape Zero Time Dilemma endings. Please take note that the walkthrough contains spoilers.
This is the most straightforward as you just need to choose the red coin during the coin toss game.
Note: I attempted a new game and choose blue coin during my first play and it was the correct coin. I choose blue after that and it fails. So it seems like there is not fixed answer to this ending. It may be random so do try it out if you fail to get it the first time.
Sharbit Guide 