PetPet

There are no monsters anymore. In the city of Lucille, Jam and her best friend, Redemption, have grown up with this lesson all their life. Then Jam meets Pet, a creature made of horns and colors and claws, who emerges from one of her mother's paintings and a drop of Jam's blood. Pet has come to hunt a monster-- and the shadow of something grim lurks in Redemption's house. How do you save the world from monsters if no one will admit they exist? -- adapted from jacket
In a near-future society that claims to have gotten rid of all monstrous people, a creature emerges from a painting seventeen-year-old Jam's mother created, a hunter from another world seeking a real-life monster