the book i’m looking for was a steampunk manga, about a girl who takes a bus/(transport?) to her new boarding school, but takes the wrong turn. she ends up at a school full of odd creatures, not human, including a bunch of faculty that are basically robots/cyborgs. a mix of cyberpunk technology parts & pieces of various prople. the book spans her defeating these faculty who want to destroy her (i think they want her body parts because she’s youthful and it will extend their life? and they were trying to extend their life as long as possible)
Lost Classics of Teen Lit: Name That Book! 