Synopsis

In a world where humans and demons coexist, a young man named Shiro is a low-ranking member of a secret organization tasked with maintaining the fragile peace between humans and demons. Shiro's mundane life is turned upside down when he is sent on a mission to investigate a series of bizarre occurrences in a small town, only to discover that the source of the disturbances is a mysterious and powerful artifact known as the "Echo." As Shiro delves deeper into the mystery, he finds himself drawn into a complex web of intrigue and deception, with forces from both human and demon worlds vying for control of the Echo and its immense power.