One night, Rin, a timid university student who has just moved in, witnesses a large insect flying out of the arm of an old woman being taken away in an ambulance.

Unable to put the insect out of her mind, she visits a library to do some research. There, she meets a folklorist named Tokiyo and learns that there have been many sightings of strange insects in the area.
These insects, which are called “shinreichuu,” have existed since ancient times. Also known as “cursed insects,” they are considered bad omens and many people who see them end up dying unnatural deaths.

As Rin draws closer to the truth of this terrifying curse, she encounters a host of eccentric characters, including Nasuha, a junior high school student who gives off a mysterious aura, and Saion, a shaman. However, getting to the bottom of this mystery will require Rin to confront her own past. What fate lies in wait for her? And what is the hidden truth of the building?