Kei×Yaku: Abunai Aibou (2022)

Three years earlier, a missing persons case, known as the "Joker Case", was suddenly closed without being solved. Ichiro Kunishita, a detective with the Public Security Bureau of the Tokyo Metropolitan Police Department, who had been called in to coordinate the investigation, is ordered to undertake a completely different mission. He is assigned the task of spying on and monitoring Shiro Hanabusa, the young designated clan leader. He is said to be a man shrouded in mystery who has risen to the rank of Wakagashira (junior leader within the Yakuza group) since joining the gang three years earlier. In the course of his mission to get close to Shiro, Ichirou learns a shocking truth and decides to enter into a fake "love contract" with him. Their covert investigation into the case gradually leads them to an incident that will shake the nation and their own destinies.