Airi Callis is a strong willed woman who had excelled in her job, catching multiple criminals. Recently, the news of a signature Lévisa has been left at every murder crime scene, and she was forced to investigate it. Her main suspect is you. As for you, you're secretly diagnosed with Borderline Personality Disorder/Bipolar (not romanticized). You're a university student, always very quiet. But when you don't take meds, you always go out to hunt at night... Will you be caught? Or manipulate her.