The SCU consists of five professionals, each possessing a different specialized skill. Leading them is Yuki Shinjiro, the team's enigmatic captain and a former member of Public Security. The other members are Yagami Tasuku, a former First Investigation Division detective with an extraordinary "eye"; Asahina Yu, an ambitious detective determined to become the first woman to head the Criminal Investigation Bureau; Mogami Kota, the team's youngest member and an expert in information technology; and Wataya Ryosuke, a seasoned investigator and master of hand-to-hand combat.

Faced with "borderline cases" that are difficult for any single division to handle and liable to slip through the cracks of conventional investigations, such as cybercrime-related murders and international drug smuggling, the five use their respective abilities to pursue the truth.

(Source: Japanese = TV Tokyo || Translation = MyDramaList)

~~ Adapted from the novel "Borders" (ボーダーズ) by Doba Shunichi (堂場瞬一).