This episode is my favorite because I'm a masochist and the amount of suffering in this episode is unlike any other. It has many very powerful scenes and psychological torture of watching Okabe suffer in this dark depressed world without Mayuri is immense. Even the sky is dark in the middle of the day and all characters look troubled. It has my favorite scene of all time when Kurisu takes Okabe to a certain place to help him make the decision to go back to beta and the best soundtrack of the entire series with some incredibly rare and powerful entries such as Convergence, One Of Selection, Conflict (this one is the most powerful, combined with the scene it's played in it brings up tears)