Their restraints are basically never released. They are also thoroughly controlled so that they do not run out of energy, so they basically never die.
The setting of the work is described a little in the fan box, if you would like to see it. (Japanese)
ERpixel
2025-01-05 01:42:18 +0000 UTC
Question about some lore; do machines or whatever ever let go of the girls they capture? If not, what happens when the girls have no more energy in them?