Naoto Jinguji is a talented researcher at the FBRP, specializing in supernatural beings. His current assignment is the first live succubus ever held in captivity — a study that was supposed to be straightforward. The planes between dimensions are overlapping with increasing frequency, which has made the bureau's leadership anxious and demanding. Naoto is being pressured for results while simultaneously developing genuine sympathy for the subject of his research. The choices he makes in navigating that tension will have consequences for his life beyond the laboratory.