Every episode drops you into a crime scene where the monster is already gone, and Banba has to reverse-engineer what it was from the wreckage. The show operates like a horror procedural where the real threat isn't dying to the creature, it's realizing these things didn't start appearing randomly. Short runtime means each episode is pure tension with no filler, thirteen episodes of mounting dread that something systemic is hunting humanity, and Banba is the only one asking the right questions.

Grotesque creatures emerge without warning, preying on ordinary people across the city. A video blogger who stages fake cryptid sightings for views watches a real monster slaughter his crew, and students at a school are hunted by a beast resembling a sandworm. Scientist Sousuke Banba sets out to learn why these monsters are appearing, with only one word to guide him: Kagewani. He visits the sites of recent attacks, hoping to find a way to wipe the creatures out for good. His investigation grows more tangled when the pharmaceutical company Sarugaku begins to intrude on his work. The result is a short-form horror mystery built on panic and suspense.