Sold to the Beasts

Ever since the war, humans were no longer the world's dominator. Supernatural creatures broke the peace treaty and colluded together to overthrew humans’ rule. After we failed completely in the battlefield, they decided to ‘purge’ the world of evil humanity. I survived from death in that brutal slaughter but was captured and imprisoned in a dungeon where I had now lived for five years. Business was the only reason why they kept immatures and even spared us shelter and food. When we reached 18, we’d be sold as slaves. That night I was bought by a mysterious guest and taken to somewhere I had never been to or heard of. My work was to serve three noble masters residing there. They were all supernatural, but decent and reasonable. So it’s better for me to carry out the plan for escaping. It all went well until someone attacked me. And the secret behind us began to be revealed.