Known as the tomboy of the Sakuraya police station, Ritsuka's confident attitude has led to her assertive reputation. While on duty, accusations regarding a cosplay scandal arose. However, on that very same day, Ritsuka came across a female victim of sexual assault in the men's restroom. Collaborating with her colleagues, Ritsuka partnered with two Criminal Investigation detectives, Daisuke Takaya and Eiji Itsuki, in an effort to reveal the culprit.