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 created a world he'd want to return to 
because he and his brother weren't arrested.
صنعتُ عالماً يريد اللاعب الجديد العودة له
لأنّه لم يُعتقل أو أخوه
habe ich eine Welt geschaffen, in die er
zurückkehren möchte, da sie nicht verhaftet wurden.
ho creato un mondo in cui il nuovo giocatore vorrà tornare,
perché lui e suo fratello non sono stati arrestati.
...como o jogador novo e o irmão não foram presos,
eu criei um mundo a que ele vai querer voltar.
я создал мир, в который захочет вернуться
Кейта. Ведь его с братом не арестовали.