A bizarre case of sudden death shakes the city of Tendoku. All signs point to a mysterious drug known as “Faust.” As detective Subaru Shizuhara and officer Sumire Natsuno delve deeper into the investigation, they uncover a terrifying truth: everything is part of a ritual to summon a demon into this world. But then, Sumire realizes something even more horrifying— a demon is hiding… inside Subaru.