The SINNERS

This world has been divided in two, and unknown forces exist in this world. They are called the Sinners. Sinners and humans have been enemies since ancient times. It was written in an old book that the sinners were actually humans before and that they had been cursed. But that book can't be found anymore. Nobody knew what had happened to the book or where it had gone.
 
Meet Maeve Vanille Fray, a new trainee demon hunter, until she meets Gian Louis Lucas Grey, a sinner with a cold personality, and Maeve will change her mind about them and unravel many secrets about the world.