In a modern world, monsters and humans coexist relatively peacefully with each other. Ryuu is just another Hellhound in a sea of people who just want to live their lives as they want. His home is a flat above the bar he works at, called the "Lost and Found". He finds it amusing that he found this place, and it has only ever brought curious humans and monsters alike through its old weathered doors, but nobody was ever truly worth mentioning. Until it brought him Setsuna.