100-man No Inochi No Ue Ni Ore Wa Tatteiru Temporada 1 Episódio 12

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 its an alternate Earth that branched off of the original Earths timeline. Upon hearing that its 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.