Kosuke Inaba serves as one of three amateur officers in the Miami City Police Department, partnered with Haruki Ishikawa and Takuro Matsumoto. Identified as a photographer, he possesses voyeuristic tendencies specifically noted as those of a "peeping tom." Alongside his colleagues, Kosuke is frequently prone to mishaps during their duties. After receiving training under the main protagonists, Yao Sakurakouji and Lu Amano, Kosuke and the other officers transition into roles as their faithful subordinates within the police force.