Akapoli

Section 5 of the Special Crimes Investigation Unit is considered a liability by others at the Metropolitan Police Department. The section consists of only four members, the section chief Osaki and his subordinates Ibuki Tona, Mizusawa Reika, and Tejima Shiori. This "experimental section," conduct their investigations in secret, as the three beauties go undercover to evade danger and catch the evil villains that lurk in Tokyo!

(Source: Yanmaga, translated)