Due to her "vigorous attitude", Ritsuka is known as the tomboy of the Sakuraya police station. While on duty, she was accused of a cosplay scandal. Later that day, she discovers a girl who had been raped by an unknown man in the men's bathroom. Along with her fellow officers, she and two other policemen from the Criminal Investigation branch—Daisuke Takaya and Eiji Itsuki—attempt to find the suspect.