There are two races on earth: Humans and Monsters.

After being released from the underground, monsters We came out of Mount Ebbot and began to live with humans.

In a small town, a blind girl named Luna lived in hiding. Despite her disability, she had an unusual ability: to sense the aura of any person or monster. She sees people in silhouettes, but she doesn't see their faces. And so is the rest of the world.

She was sitting on a chair reading a book, and her service dog, Echo, was playing with his toys.