Hoshino Ichika is main heroin of this story. She is a rookie police officer working in the Special Regions Crime Prevention Office (SRCPO). While working, she becomes the target of an attack by the terrorist organization, Adonis. They place a poisoned necklace around her neck. Ichika, along with detectives, like Aiji, Takeru, and Mineo, is tasked with solving the terror case involving Adonis and freeing her from the poisoned collar.