Ritsuka, renowned for her spirited demeanor, is dubbed the tomboy at Sakuraya police station. During her shift, she faces allegations of involvement in a cosplay controversy. However, her day takes a grim turn when she uncovers a girl assaulted by an unidentified assailant in the men's restroom. Teaming up with her police colleagues and two members from the Criminal Investigation unit, Daisuke Takaya and Eiji Itsuki, they embark on a mission to apprehend the perpetrator.