It's just a bit weird - when he was kidnapped there was nothing really going on (maybe a small warning, but society was still whole) but when he woke up the kidnappers already had a solid plan of what they wanted to do and some experience at defending themselves..
This kinda feels like whats going on with Darwins Game right now and Worlds End Harem with the MC having eyes for one person and trying to resist tempation, this is a really interesting manga concept