The book is a Hobbesian nightmare. It argues that without the Leviathan (the state), life is not merely "nasty, brutish, and short"—it is muddy, tedious, and degrading. Reila loses her "personhood" not because she is physically broken, but because no other person recognizes her humanity.
That moment is the thesis of the entire work: Buta no Gotoki Sanzoku ni Torawarete
Her arc is one of radical acceptance. She accepts that her father wrote her off as a loss. She accepts that her virginity is a commodity. She accepts that the world is not a song. By accepting these things, she gains a cold, hard agency. The book is a Hobbesian nightmare