Dude, what if Anya's backstory is literally the plot of The Promised Neverland volumes 1 to 4,
Like the similarities of the numbers on the kids necks and the serial number that Anya got named, the kids being used for a selfish goal: Anya being experimented on for the sake of world peace, and the Grace Field kids getting shipped off to become food for the Demons,
Well ofc Anya wouldn't had to deal with the Demons cuz they don't exist in SxF, but I'd seriously doubt she and other Lab kids wanted to be stuck in the Laboratory forever and probably hatched an escape plan similar to the one the Grace Field kids had.
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