Titanic body parts fall from the sky. Corpses are discovered with all their internal organs mysteriously absent. In a seaside town, an entire community smiles as they die, dreaming of eternal life. These are not random horrors but the work of divine beings beyond mortal comprehension, forces that threaten peace across Japan. To handle these impossible incidents, a secret government organization operates the Divine Incursions Special Investigations Department.

The story follows two central agents. Katagishi is the weary, chain-smoking senior investigator, a man haunted by a personal tragedy who approaches each case with a grim sense of duty. He is partnered with Miyaki, a younger and more energetic junior agent whose enthusiasm and sharp mind balance her partner’s dour demeanor. Their boss is Mitsuji Rokuhara, who also happens to be Katagishi’s former brother-in-law, adding a layer of personal history to their professional relationship.

The narrative is distinctly episodic, structured around the cases the pair investigate as they travel to rural villages and forgotten towns across Japan. Each location is plagued by a unique supernatural phenomenon tied to a local deity. In one village, a god forgotten by the townspeople manifests its anger by dropping a different colossal body part from the sky every year, an event that began during a festival in 1997. In another case, the agents investigate a god known as The God That Ate Men, confronting a mystery where the line between folklore and gruesome reality blurs. The most unsettling case takes them to a tourist town hiding a dark secret, where a local legend of a mermaid who granted immortality through cannibalism appears to be disturbingly real.

Beneath the surface of these case-of-the-week mysteries, a larger narrative arc unfolds. The investigations are not just professional obligations for Katagishi; they are a personal crusade. He is relentlessly searching for his missing wife, a secret quest that drives him to confront dangerous truths and is the reason he pursues these divine mysteries with such a heavy heart. The series explores the intersection of belief and existence, suggesting that gods persist because they are remembered. As modern life and progress cause ancient worship to fade, these neglected deities begin to lash out in strange, often horrific ways, leaving agents like Katagishi and Miyaki to manage the fallout and search for answers in a world where true understanding remains forever out of reach.