Miwa Makitaka is a Senior Police Officer in the First Investigation Section of the Okajima Prefectural Police. She entered the force via competitive Category A recruitment after university, resulting in her being slightly older than colleagues from the same academy class (including Takeshi Yamada and Mai Kawai) who joined directly from high school.

Her meticulous attention to detail, especially concerning paperwork, builds trust with investigators who rely on her thoroughness. Colleagues acknowledge her intellectual capacity to pass promotion exams but also her consistent refusal to advance in rank, driven by reluctance to accept greater responsibilities. This aversion includes physical duties; she ranks as the station's least athletic member and actively avoids strenuous tasks.

Her career choice stems from a deep fascination with the historical Shinsengumi and author Ryotaro Shiba, particularly his book "Moeyo Ken." She perceived parallels between modern police work and the Shinsengumi's duties. This historical passion defines her identity among peers, who view her as an eccentric "Rekijo" (history woman).

Socially, her limited experience with men—attributed to attending an all-girls high school—manifests as pronounced discomfort around sexual offenders during investigations. Colleagues occasionally reference her peculiarities through humor, such as remarks about celebrating potential romantic relationships "as long as the other person is alive," alluding to her fixation on historical figures.

She typically wears a loose-fitting jacket and maintains a professional demeanor despite these unconventional personal interests.