This ending.
Yes, it's an NSFW game, but the message of this ending is more interesting than the adult content. Basically, the girl is the only survivor of a war that wiped everyone else out. If you look at my thread the end of humanity via conventional war is a possibility, but an unlikely one. As someone with a number of friends in the mid-single digits, I am always lonely, but I can go out, and get some bubble tea, ramen, a good milkshake, or some Mcdonald's fires. This girl has no one to interact with, I mean sure you can explore, but it will get lonely. It's also a fear of mine that after I die a VR headset ends, and I look around, and I am the only one.