As her reward for completing the quest, Tokitate gets to ask the Game Master whether this alternate world is actually virtual or not... and the answer is that it's an alternate Earth that branched off of the original Earth's timeline. Upon hearing that it's an existing world, Yotsuya trembles with the realization that he killed real people. Once he returns to the real world and resumes his normal life, the Game Master appears before him in the form of a young girl and leads him to a meeting with the next new player.
I watched this video a couple days ago, 
and I realized there was a hint hidden in it!
،شاهدتُ مقطعاً قبل عدّة أيام
!وأدركتُ وجود تلميحٍ به
Ich habe mir das Video vorgestern angesehen
und gemerkt, dass darin ein Hinweis versteckt ist!
¡Vi un video hace un par de días
y noté que había una pista escondida!
¡Vi un vídeo hace un par de días
y había una pista escondida!
J’ai remarqué qu’il y avait un indice
dans la vidéo que j’ai vue avant-hier.
Un paio di giorni fa, ho guardato questo video
e ho capito che c'era un messaggio nascosto!
Vi este vídeo uns dias atrás e percebi
que há uma dica escondida nele!
На днях я посмотрела одно видео,
и, думаю, в нём что-то сокрыто.