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.
They believed what they 
were doing was right.
آمنوا أنّ ما يفعلونه هو الأمر الصحيح
waren sie der festen Überzeugung,
im Namen der Gerechtigkeit zu handeln.
Ellos creían que estaban
haciendo lo correcto.
Ellos creían que estaban
haciendo lo correcto.
Ils avaient leur propre justice
qu’ils suivaient à la lettre.
Loro erano convinti di essere nel giusto.
Eles acreditavam em
sua própria justiça.
Они ведь считали,
что поступали правильно.