Kei X Yaku: Bound By Law 1

Ichiro, an agent with the Tokyo Metropolitan Public Security Bureau, receives orders to make contact with and closely surveil Shiro, a yakuza hotshot whose bed partners include a considerable amount of influential male politicians. The mission takes an unexpected turn when they realize they've both been pursuing the same cold case: the disappearance of Rion Nakaba, Ichiro's senior and Shiro's sister. Determined to uncover the truth, the two secretly team up under the guise of lovers to try ...