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.
It is a planet that exists in the same 
place as Earth in a parallel wor.
إنّه كوكب يوجد في نفس مكان الأرض
في عالمٍ موازٍ
Es ist ein Planet, der an derselben Stelle
wie die Erde, in einer Parallelwelt, existiert.
Es un planeta que existe donde estaría
la Tierra, pero en un mundo paralelo.
Es un planeta que existe donde estaría
la Tierra, pero en un mundo paralelo.
C’est un monde parallèle, une planète
se trouvant aux coordonnées de la Terre.
È un pianeta che esiste nello stesso posto 
della Terra in un mondo paralle.
É um planeta que existe no mesmo lugar
que a Terra, em um mundo parale.
Эта планета существует на месте
Земли в параллельном ми.