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.
meaning this world was still the 
reality she wanted to return to.
ما يعني أنّ هذا العالم بقي الواقع
الذي أرادت العودة له
was diese Welt noch immer zur Realität machte,
zu der sie zurückkehren wollte.
Por lo que este seguiría siendo
un mundo al que quisiera regresar.
Por lo que este seguiría siendo
un mundo al que quisiera volver.
Du coup, il existe un monde réel
où elle veut rentrer.
e perciò questo mondo
era la realtà in cui lei voleva tornare.
então este mundo ainda era um lugar
pra onde ela queria voltar.
Этот мир оставался таким,
в какой ей хотелось вернуться.