Eight has a name, a real name. The problem is she can't remember it.

The people around her don't remember theirs either. Like her, they're all trapped in what seems to be the same dream without a name—just a number. In order to leave this place, you must "awaken" to your real name.

Much to Eight's relief, she finds a familiar face. Just by looking at him she knows he is her brother, even if neither of them can remember each other's names. She believes they're trapped in a dream; her brother thinks differently. Little by little they piece together their scattered memories to "awaken": how it ends depends on who you think is right.

[From itch.io]