Reincarnated Slave's Salvation

there was a girl who often got bullied by her classmates. but then the bullying got too carried away and she breathed her last. But once she opens her eyes, she was in an unfamiliar place.yes, she got reincarnated to another wolrd. she thought she could have a happy life in that wolrd but her hopes was shattered to pieces by a disaster. and because of that, she become a slave....